Vidra

Perhaps a nickname surn., connected with lit. vidrùs „smarkus, staigus“ ¹. Cf. still lit. výdra „vėtra, audra“ (DLKŽ). However, other connections are also possible, cf. polish Wydra (SSNO VI 223), bRuss. Bыдpа, Ukr. Bыдpа ², Russian. Bыдpа (CAМC I 944).