Ulrich Wille's family was from La Sagne in the Canton of Neuchâtel. One of his ancestors settled in Hamburg and renamed the family name, "Vuille", to the more German "Wille". Ulrich's parents were journalist and politician François Wille (1811–1896) and novelist Eliza Wille-Sloman (1809–1893). They were liberals and, due to their disillusion by the failed German revolutions of 1848–49, they left Hamburg for Switzerland with their newborn son Ulrich. They settled in Meilen in the Canton of Zürich, where Ulrich grew up in "Mariafeld", the family estate.