More possible names for UFOs:

Unidentified Anomalous Phenomenon


Per Ross Coulthart:   UAM or Unauthorized Aircraft Movements

Per Christopher Mellon and John Alexander:  UCT or Uncorrelated Targets

Per Luis Elizondo: Unresolved Anomalies or Unidentified Aerial Systems

From? : Unidentified Aerial Sightings (UAS)

Per Ryan Sprague: Unidentified Luminous Objects (ULO)

Per Greer: Alien Reproduction Vehicles

Per Navy and Preliminary UAP Report: Range Foulers

Per @UFOS8N: Unknown Geospatial Target / Anomalous Geospatial Vehicle