Names of planetary and lunar features can be found on the Gazeteer of Planetary Nomenclature here:
https://planetarynames.wr.usgs.gov/
Unfortunately no planetary and lunar features are named after Lacaille, Dunlop or Mechain.
There is a faint asteroid called Jamesdunlop
https://ssd.jpl.nasa.gov/sbdb.cgi?ss...og=0;cad=0#orb