Vasileios (Βασίλειος)
Also: Basil, Vasilis, Bill
Name day:
1 January
✓ sourced
Sources: namedays.gr / eortologio.gr online database (T2), OCA daily calendar (Slavic lineage — dates only, never name→feast) (T2)
St Basil the Great. OCA 2026-01-01 + namedays.gr VASILIS 1 January.
Sourced (✓) feasts are confirmed by two lineage-independent sources and are safe to put in a calendar. Unverified (⚠) feasts — whether resting on a single source or on a judgment call awaiting the printed synaxaria — are shown for reference but held out of feeds until confirmed.