The name Claes is a boy's name meaning "victory of the people". Claes and is often added to lists like Creative Baby Names: Inspired by Artists and discussed in our forums with posts like "Early 1900s CAF (possibly very large family)".
From the experts:
Pronounced klaus, this spelling of the name is associated in this country with the major Pop Art sculptor Swedish-born Claes Oldenburg, known for his colossal public sculptures of everyday objects such as lipsticks and binoculars, and the "Happenings" performance art of the 1960s. Variations include CLAUS, KLAUS, KLAES, and CLAAS.