Latin word tuum comes from Proto-Indo-European *towos, Proto-Italic *towos (Your; second-person singular possessive.)

Detailed word origin of tuum

Dictionary entry	Language	Definition
*towos	Proto-Indo-European (ine-pro)
*towos	Proto-Italic (itc-pro)	Your; second-person singular possessive.
tua	Latin (lat)

Words with the same origin as tuum