millhouse/ˈmɪlˌhaʊs/EtymologyFrom mill + house. Doublet of Mulhouse.millhouse means A surname. Lexicurio rates it Sui generis — a strength score of 89 out of 100.millhouse is pronounced /ˈmɪlˌhaʊs/.nameA surname.nounA building housing a gristmill, especially a domestic building that is also a mill.