Etymology

rainer

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Today it means: That which rains, or dispenses something in a shower. Full definition →

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rainer · noun1

From rain + -er.

Rainer · proper noun2

Variant 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.

Etymology from Wiktionary, CC BY-SA 4.0.