First recorded as a given name of Latvians in 1781. From Russian, ultimately from Ancient Greek. Cognate with English Basil.
- A transliteration of the Russian male given name Василий (Vasilij).
- A male given name of Latvian speakers.
- Klāvs Siliņš: Latviesu personvārdu vārdnīca. Riga "Zinātne" 1990, ISBN 5-7966-0278-0
-  Population Register of Latvia: Vasilijs was the only given name of 4459 persons in Latvia on May 21st 2010, including Russian speakers.