Sperauskas

The origin is not entirely clear. Perhaps it is glorified by some Lithuanian surn., whose root sper- could be connected with lit. spḗrus „greitai, sparčiai atliekamas, padaromas, įvykstantis; sparčiai, vikriai dirbantis, greitai ką darantis; spartus bėgti, lėkti, skristi, eiti, greitas“ (LKŽ XIII 380-381) or similar. But cf. Speranskis, Spérskas (see) and (?) Spiráuskas (see).