Any Unknown or Unlisted Aircraft Manufacturer
Distraction; Situational Awareness; Communication Breakdown; Confusion
Conflict NMAC; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Became Reoriented; Flight Crew Took Evasive Action
Airport; Chart Or Publication
LNN has apparently recently changed its name to 'Lake County.' However; the chart says 'Willoghby/Lost Nation' and the ASOS broadcast also says 'Willoghby/Lost Nation.' [I was] arriving recently [and] several aircraft were in the pattern. Some were saying 'Lost Nation traffic' during their calls with others saying 'Lake County traffic.' I was a transient pilot unfamiliar with the airport. I was unable to visually identify all local traffic. Due to the naming mismatch; I was unaware that one other aircraft in the pattern was present; as he was calling it 'Lake County' while I and others were calling it 'Lost Nation.' One other transient aircraft appeared to nearly have a collision taking evasive maneuvers. He later said over the frequency; 'Sorry I haven't been here before.' He was also referring to the airport as 'Lost Nation' as listed on the charts and weather broadcast. I was informed by the Attendant at the FBO that the name recently changed. It is EXTREMELY DANGEROUS that the names on the charts and the names on the weather broadcast do not match the names of the airports. The chart should only have one name listed - the name used to reference the airport in traffic call-outs. The age-old system of having 'local knowledge' at uncontrolled fields is antiquated; unsafe; and completely dangerous. There is no reason the chart could not be updated; a useful NOTAM published; and a recording on the ASOS 'Lost Nation is now Lake County.' Signs could be posted near the Ramp and near the runway ends as well.
Pilot reported a non-towered airport's publications and ASOS broadcast have not been updated to reflect a recent name change; with the inconsistency in naming causing NMAC events.