Senauskas

Cf. Senèckis (see). These are most likely borrowed examples, the roots of which can be traced back to the abbreviation of the baptismal name Simeõnas, cf. Brus Cень: Cимеoн ¹, Cеня: Cямён ², Russ. Cеня: Cемён ³, Polish. Sień (SSNO V 68), Sieniawski, Sianiawski, Siniawski, Sieniewski, Sieniowski (ibid. 65), Sienic(s)ki, Sien(n)ic(s)ki (ibid.), etc.