Vilko is quite often used on its own. In Croatia it was most popular in the 1960s and I know a fer Vilkos that are Czech.
Here's a link to a list of famous Vilkos in Croatia:
http://www.imehrvatsko.net/Imena/Vilko/tabid/9841/Default.aspx
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Current favorites:
EiraElenaElisabethErinEva
EliasElijah –
EliEmanuelErikEwan