Pliny's dates are pinned to the eruption of Mount Vesuvius in AD 79 and a statement of his nephew that he died in his 56th year, which would put his birth in AD 23 or 24.

Pliny was the son of an equestrian Gaius Plinius Celer and his wife Marcella.
Neither the younger nor the elder Pliny mention the names.
Their ultimate source is a fragmentary inscription (CIL V 1 3442) found in a field in Verona and recorded by the 16th-century Augustinian monk Onofrio Panvinio at Verona.
The form is an elegy.
The most commonly accepted reconstruction is
PLINIVS SECVNDVS AVGV.
LERI.
PATRI.
MATRI.
MARCELLAE.
TESTAMENTO FIERI IVSSO
The Vs represent Us.
It should say
Plinius Secundus augur ordered this to be made as a testament to his father [Ce]ler and his mother [Grania] Marcella
The actual words are fragmentary.
The reading of the inscription depends on the reconstruction, but in all cases the names come through.
Whether he was an augur and whether she was named Grania Marcella are less certain.
Jean Hardouin presents a statement from an unknown source that he claims was ancient, that Pliny was from Verona and that his parents were Celer and Marcella.
Hardouin also cites the conterraneity (see below) of Catullus.

How the inscription got to Verona is unknown, but it could have arrived by dispersal of property from Pliny the Younger's then Tuscan (now Umbrian) estate at Colle Plinio, north of Città di Castello, identified with certainty by his initials in the roof tiles.
He kept statues of his ancestors there.
Pliny the Elder was born at Como, not at Verona: it is only as a native of old Gallia Transpadana that he calls Catullus of Verona his conterraneus, or fellow-countryman, not his municeps, or fellow-townsman.
A statue of Pliny on the façade of the Duomo of Como celebrates him as a native son.
He had a sister, Plinia, who married into the Caecilii and was the mother of his nephew, Pliny the Younger, whose letters describe his work and study regimen in detail.

In one of his letters to Tacitus (avunculus meus), Pliny the Younger details how his uncle's breakfasts would be light and simple (levis et facilis) following the customs of our forefathers (veterum more interdiu).
This shows that Pliny the Younger wanted it to be conveyed that Pliny the Elder was a "good Roman", which means that he maintained the customs of the great Roman forefathers.
This statement would have pleased Tacitus.

Two inscriptions identifying the hometown of Pliny the Younger as Como take precedence over the Verona theory.
One (CIL V 5262) commemorates the younger's career as the imperial magistrate and details his considerable charitable and municipal expenses on behalf of the people of Como.
Another (CIL V 5667) identifies his father Lucius' village as Fecchio (tribe Oufentina) near Como.
Therefore, Plinia likely was a local girl and Pliny the Elder, her brother, was from Como.

Gaius was a member of the Plinia gens: the insubric root Plina still persists, with rhotacism, in the local surname "Prina".
He did not take his father's cognomen, Celer, but assumed his own, Secundus.
As his adopted son took the same cognomen, Pliny founded a branch, the Plinii Secundi.
The family was prosperous; Pliny the Younger's combined inherited estates made him so wealthy that he could found a school and a library, endow a fund to feed the women and children of Como, and own multiple estates around Rome and Lake Como, as well as enrich some of his friends as a personal favor.
No earlier instances of the Plinii are known.

In 59 BC, only about 82 years before Pliny's birth, Julius Caesar founded Novum Comum (reverting to Comum) as a colonia to secure the region against the Alpine tribes, whom he had been unable to defeat.
He imported a population of 4,500 from other provinces (not clear from where) to be placed in Comasco and 500 aristocratic Greeks to found Novum Comum itself.
The community was thus multi-ethnic and the Plinies could have come from anywhere; whether any conclusions can be drawn from Pliny's preference for Greek words, or Julius Pokorny's derivation of the name fr
Pliny's dates are pinned to the eruption of Mount Vesuvius in AD 79 and a statement of his nephew that he died in his 56th year, which would put his birth in AD 23 or 24.
Pliny was the son of an equestrian Gaius Plinius Celer and his wife Marcella. Neither the younger nor the elder Pliny mention the names. Their ultimate source is a fragmentary inscription (CIL V 1 3442) found in a field in Verona and recorded by the 16th-century Augustinian monk Onofrio Panvinio at Verona. The form is an elegy. The most commonly accepted reconstruction is
PLINIVS SECVNDVS AVGV. LERI. PATRI. MATRI. MARCELLAE. TESTAMENTO FIERI IVSSO
The Vs represent Us. It should say
Plinius Secundus augur ordered this to be made as a testament to his father [Ce]ler and his mother [Grania] Marcella
The actual words are fragmentary. The reading of the inscription depends on the reconstruction, but in all cases the names come through. Whether he was an augur and whether she was named Grania Marcella are less certain. Jean Hardouin presents a statement from an unknown source that he claims was ancient, that Pliny was from Verona and that his parents were Celer and Marcella. Hardouin also cites the conterraneity (see below) of Catullus. 
How the inscription got to Verona is unknown, but it could have arrived by dispersal of property from Pliny the Younger's then Tuscan (now Umbrian) estate at Colle Plinio, north of Città di Castello, identified with certainty by his initials in the roof tiles. He kept statues of his ancestors there. Pliny the Elder was born at Como, not at Verona: it is only as a native of old Gallia Transpadana that he calls Catullus of Verona his conterraneus, or fellow-countryman, not his municeps, or fellow-townsman. A statue of Pliny on the façade of the Duomo of Como celebrates him as a native son. He had a sister, Plinia, who married into the Caecilii and was the mother of his nephew, Pliny the Younger, whose letters describe his work and study regimen in detail.
In one of his letters to Tacitus (avunculus meus), Pliny the Younger details how his uncle's breakfasts would be light and simple (levis et facilis) following the customs of our forefathers (veterum more interdiu). This shows that Pliny the Younger wanted it to be conveyed that Pliny the Elder was a "good Roman", which means that he maintained the customs of the great Roman forefathers. This statement would have pleased Tacitus.
Two inscriptions identifying the hometown of Pliny the Younger as Como take precedence over the Verona theory. One (CIL V 5262) commemorates the younger's career as the imperial magistrate and details his considerable charitable and municipal expenses on behalf of the people of Como. Another (CIL V 5667) identifies his father Lucius' village as Fecchio (tribe Oufentina) near Como. Therefore, Plinia likely was a local girl and Pliny the Elder, her brother, was from Como.
Gaius was a member of the Plinia gens: the insubric root Plina still persists, with rhotacism, in the local surname "Prina". He did not take his father's cognomen, Celer, but assumed his own, Secundus. As his adopted son took the same cognomen, Pliny founded a branch, the Plinii Secundi. The family was prosperous; Pliny the Younger's combined inherited estates made him so wealthy that he could found a school and a library, endow a fund to feed the women and children of Como, and own multiple estates around Rome and Lake Como, as well as enrich some of his friends as a personal favor. No earlier instances of the Plinii are known.
In 59 BC, only about 82 years before Pliny's birth, Julius Caesar founded Novum Comum (reverting to Comum) as a colonia to secure the region against the Alpine tribes, whom he had been unable to defeat. He imported a population of 4,500 from other provinces (not clear from where) to be placed in Comasco and 500 aristocratic Greeks to found Novum Comum itself. The community was thus multi-ethnic and the Plinies could have come from anywhere; whether any conclusions can be drawn from Pliny's preference for Greek words, or Julius Pokorny's derivation of the name fr
Pliny the Elder