だれか
someone
誰 who, with か on the end so it stops being a question. Not anyone in particular. Just go and ask somebody, anybody: だれか.
The same か turns 何 into 何か 'something' and どこ into どこか 'somewhere'.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.