From Wiktionary, the free dictionary
First recorded in 1601. From Vilhelms (“William”). Comparable to German Willy or English Willie.
Vilis m
- a male given name
- Klāvs Siliņš: Latviesu personvārdu vārdnīca. Riga "Zinātne" 1990, →ISBN
- [1] Population Register of Latvia: Vilis was the only given name of 1520 persons in Latvia on May 21st 2010.