Pallas's Leaf Warbler is named after the German zoologist Peter Simon Pallas, who discovered it on the Ingoda River in Siberia in 1811; the species name proregulus derives from its similar size to the Goldcrest Regulus regulus.
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The river has its sources in the Yablonovy Mountains, and then flows in a south-southwesterly direction, until it joins the Ingoda River in the city of Chita (which has its name from the river).