On Lithuanian Wikipedia I've found a person named Antanas Kvedaravičius who is also called by the Polonized version of their name, Antoni Kwiedorowicz.
https://lt.wikipedia.org/wiki/Antanas_Kvedaravi%C4%8Dius
Kwiedorowicz is possibly a variant of Chwiedorowicz or Chwedorowicz, which come from Chwiedor or Chwedor, forms of the name Fyodor (see
https://nazwiska.ijp.pan.pl/haslo/show/name/CHWEDORUK).