How about labeling based on names of galaxies...
Triangulum 50k LY across NGC 1365 200k LY across
Sombrero 50k LY across Andromeda 220k LY across
NGC 908 75k LY across Fomax A 220K LY across
Centaurus A 97k LY across NGC 4921 230K LY across
The Milky Way 100k LY across ESO 507-070 240K LY across
Hoagg's Object 120k LY across The Tadpole 390K LY across
NGC 6670 120k LY across Cygnus A 500K LY across
Cartwheel 150k LY across Malin 1 650K LY across
NGC 7049 150k LY across Hercules A 1,500K LY across
M100 160k LY across
Arp 81 200k LY across