Likewise, Greenfield was most likely originally Grunfeld or Gruenfeld.
When your family members traveled to the US, they would have been listed on the ship passenger lists under their old surnames, and not the Americanized versions of them. The first names would most likely have been the Yiddish versions of their Hebrew names.
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