(n.) One who gives; a donor\; a bestower; a grantor; one who imparts or distributes.

Maecenas Santa Claus almoner almsgiver angel assignor awarder backer bestower cheerful giver conferrer consignor contributor donator donor fairy godmother feoffor financer funder grantor imparter lady bountiful patron patroness philanthropist presenter settler subscriber sugar daddy supporter testate testator testatrix vouchsafer