For my family from Kovna gubernia, the name Aaron is often in Jewishgen listings as Aron and as Orel (Yiddish nickname for Aaron).
I also second looking for listings for all of Kovna gubernia. I have found in ship manifests and other US records that my family members would say they were from Kovna, when they were actually from smaller towns in the gubernia.
Lak/Lok/Liak/Lock and Kalon/Kolon in Zagare/Joniskis/Gruzdziai, Lithuania
Lak/Lok/Liak/Lock in Plunge/Telsiai in Lithuania
Trisinsky/Trushinsky/Sturisky and Leybman in Dotnuva, Lithuania
Olitsky in Alytus, Suwalki, Poland/Lithuania
Gutman/Goodman in Czestochowa, Poland
Lavine/Lev/Lew in Trenton, New Jersey and Lida/Vilna gub., Belarus