Leontiy Ivanovich Sivstov (1872-1919) was a church reader who lived in Unalaska. Along with Aleksey Yachmenev, who like Sivstov was Aleut himself, Sivstov accompanied Waldemar Jochelson on his 1909-1910 ethnological studies on the Aleut.
Bergsland, Knut (1994). Aleut Dictionary = Unangam Tunudgusii: an unabridged lexicon of the Aleutian, Pribilof, and Commander Islands Aleut language. Fairbanks, AK: Alaska Native Language Center, University of Alaska. ISBN 1-55500-047-9. pg. viii
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