Žalkauskas

Cf. Žalkẽvičius, Žalkovičius (see). The root žalk- is possibly with the suffix -k- made from žal- (see Žalỹs), cf. lit. žálka „žalioji“, žal̃kas „daigas“ (LKŽK) and so on. However, other connections are sometimes possible, cf. polish Żołkowski, Żołkiewski, Żołka (SSNO VI 367).