LTReikšminiai žodžiai: Krikštas; Pavardės; Polonizacija; Tikriniai vardai; Vasilijus (Bazilijus); Christening; Personal names; Polonization; Surnames; Vasili (Basili).
ENThe present article investigate Lthuanian surnames containing Slavonic elements, in particular surnames originated from baptismal Greek name ΒΑΣΙΛΕΥΣ and its derivatives which came to Lithuania via Slavonic languages. A Lithuanian baptismal name Bazilijus which remains in Lithuanian surnames Bazilius, Bazylius has come via the Polish language, cf. Pol. Bazyli. All other surnames with this stem contain Slavonic suffixes and they all were borrowed: Bazylevskis, Bazilevičius, Baziliauskas, cf. Pol. Bazylewski, Bazylewski, Beloruss. Базылеу Базылевич. A separate part (which is much more numerous) consist of Lithuanian surnames containing a stem Vasil- originated from East Slavs. In Lithuanian onomastics, there is no such name as Vasilijus; however, it remains in Lithuanian surnames Vasilis, Vasilius, Vosylius. This is only derivative containing Lithuanian suffix: Vasiliūnas, Vosiliūnas. All other surnames with this stem contain Slavonic suffixes and most probably are non-Lithuanian but borrowed: Vasiljevas, cf. Beloruss. Васiлеу, Russ. Василевский, Pol. Wasilevski. There are peculiar derivatives from a Slavonic clipping VASIA, cf. Beloruss., Russ. ВАСЯ, both containing Lithuanian suffixes - Vasaitis, Vasiulis, Vasiūnas and Slavonic suffixes - VASAUSKAS, VASEVIČIUS. From a Slavonic name Vaska we have Lithuanian surname Vaske and their further derivatives with Lithuanian suffix - Vaskėla and Slavonic suffix - Vaskevičius. [From the publication]