Sven is a Scandinavian masculine first name. . In Old Norse the meaning was "young man" or "servant" and the original Old Norse spelling was sveinn. Variants such as Svend are found in Danish and Norwegian. Another variant, Svein is used only in the Low Countries and German-speaking countries, and is cognate with the English surname Swain. In medieval Swedish, sven or sven av vapen "sven of arms", is a term for squire. The female equivalent, Svenja, though seemingly Dutch and Scandinavian, is not common anywhere outside of German-speaking countries.
https://en.wikipedia.org/wiki/Sven