On 19 January 1822, Rønnenkamp married Jessy Caroline Howden in Helsingør (1796-1872).
The couple had no children.
They created a number of charities and grants.
These included a home for 16 men and women from their two estates in Næsby (Den Rønnenkampske Stiftelse), a home for old seamen in Flensburg, a grant for purchase of paintings and sculptures and Christiansdal kloster with residences for 24 women.
Rønnenkamp's widow left an additional DKK 500,000 to Christiansdal kloster.

Rønnenkamp left the estates at Næstbyholm and Bavelse to his sister Hanna's  grandson, Peter Christian Müller (1854-1930), who adopted the surname Howden-Rønnenkamp.
On 19 January 1822, Rønnenkamp married Jessy Caroline Howden in Helsingør (1796-1872). The couple had no children. They created a number of charities and grants. These included a home for 16 men and women from their two estates in Næsby (Den Rønnenkampske Stiftelse), a home for old seamen in Flensburg, a grant for purchase of paintings and sculptures and Christiansdal kloster with residences for 24 women. Rønnenkamp's widow left an additional DKK 500,000 to Christiansdal kloster.
Rønnenkamp left the estates at Næstbyholm and Bavelse to his sister Hanna's  grandson, Peter Christian Müller (1854-1930), who adopted the surname Howden-Rønnenkamp.
Christian Rønnenkamp