Where does “stava” come from?

stava (Swedish) comes from Swedish stav, from Old Swedish staver, from Old Norse stafr, from Proto-Norse ᛋᛏᚼᛒᚼ, from Proto-Germanic stabaz, from Proto-Indo-European stebʰ- — to stand still; to harden.

stava (Swedish): to spell; to write the individual letters of a...