Dower: from Medieval Latin dotarium, from Latin dotare “to endow, portion,” from dos (genitive dotis), from PIE *do-ti, from root *do- “to give”, *dō-, Proto-Indo-European root meaning “to give.”
It is the hypothetical source of/evidence for its existence is provided by: Sanskrit dadati “gives,” danam “offering, present;” Old Persian dadatuv “let him give;” Greek didomi, didonai, “to give, offer,” dōron “gift;” Latin dare “to give, grant, offer,” donum “gift;” Armenian tam “to give;” Old Church Slavonic dati “give,” dani “tribute;” Lithuanian duoti “to give,” duonis“gift;” Old Irish dan “gift, endowment, talent,” Welsh dawn “gift.”