I have many Geffens from Vilkomir as well.
My great great great grandfather was Abram Geffen (b. 1837).
His son (my great great grandfather) was David Geffen (b. 1862),
and his daughter (my great grandmother) was Elizabeth Geffen (b. 1899) married name Goldberg.
Her brothers and sister: Annie (b. 1884) - married name Bernstein, Samuel (b. 1893), Isidor Jacob (b. 1895), Max (b. 1898).