Joos (surname)

Joos is a surname of Dutch and German origin. It is considered to be a patronymic name, derived from a shortened form of the given name "Joost" or "Jos," which are Dutch and German variants of the name "Judocus." Judocus was a 7th-century Breton saint. The name Judocus means "lord" or "zealous." Therefore, the surname Joos essentially means "son of Joost/Jos/Judocus" or "descendant of Joost/Jos/Judocus."

The surname is found most commonly in the Netherlands, Belgium, and Germany. Variations of the name include Joost, Joosen, and Joessen. Like many surnames, the spelling may have evolved over time and through different geographical locations.