Related words 誰でも is the plain, most common form meaning 'anyone', while 誰にでも is an adverbial variant marked with に that is used before positive verbs for extra emphasis.
誰でも emphasizes 'no matter who, anyone at all' as a subject or general statement, whereas 誰にも is used specifically for indirect objects, passive agents, or things residing in people.
Don't confuse with 誰も pairs with a negative predicate to mean 'nobody', while 誰でも means 'anyone/everyone' and works in affirmative, negative, or conditional sentences.
誰か means 'someone' (one unspecified person), whereas 誰でも means 'anyone/whoever' regardless of who it is.
Etymology Compound of 誰 (dare, 'who') + でも (demo, 'even, also'). The combination yields the meaning 'anyone' or 'whoever'.
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