US Popularity Rank: None

Origin: German

Meaning: Determined guardian

A masculine name, Willhelmus is a variant of Wilhelmus, a German surname that dates back to early medieval times. This name was linked to an influential noble family involved in social, economic, and political matters. Wilhelmus is both the Latinized and the Dutch version of Wilhelm, which, in the Netherlands, is more commonly seen on birth certificates than heard in day-to-day life. Still, those intent on using this name will love its beautiful meaning of “determined guardian,” feeling safe and protected by Willhelmus’ influence.