rainerEtymologyVariant of Rayner, a patronymic surname from a medieval given name from Proto-Germanic *raginą (“counsel by the gods”) + *harjaz (“army”). Also borrowed from modern German.rainer means an English and American surname transferred from the given name. Lexicurio rates it Rare gem — a strength score of 80 out of 100.nameAn English and American surname transferred from the given name.nounThat which rains, or dispenses something in a shower.“c, 1893-1899, Ralph T. H. Griffith (translator), The Vedas Indra, Brhaspati, rainers of treasure, rejoicing at this sacrifice drink the Soma.”