There should be immigration documents that show both the point of departure and the place of origin. Of course, the world was constituted differently then, so the place of origin may have slipped into obscurity.

There is a community of Serbs and Croatians in the Seattle/Tacoma area, and that is name is a Slavic patronymic, so you've got a bit of a lead there--and, since immigrant communities tend to center around churches, there probably are church records relating to the family--Croatian uses Latin letters, and "vitch" is typically spelled "vic",so, offhand, you might start with the Serbian churches--

Depending on how hard you want to look--