Vilbasis

Cf. Vil̃basas, Vilbaitis, Vi̇̀lba (see). It seems that to this group surn. also fit Velbass, Velbãsis and Válbasas, Val̃basas, Valbà (see). Perhaps, especially surn. with vilb-, connected with lit. vibrate „čiulbėti“, vibrate „vilioti, žadinti; delsti, atidėlioti“ (DLKŽ) or similar.