Where does “полк” come from?

полк (Buryat) comes from Classical Mongolian ᠹᠣᠤᠯ, from Russian полк, from Old East Slavic пълъкъ, from Proto-Slavic pъlkъ, from Proto-Germanic fulką, from Proto-Indo-European pleh₁- — to fill.

полк (Buryat): regiment

Definitions

regiment

Ancestry of “полк”, step by step

Step	Language	Word	Meaning
1	Classical Mongolian	ᠹᠣᠤᠯ	—
2	Russian	полк	regiment
3	Old East Slavic	пълъкъ	—
4	Proto-Slavic	pъlkъ	troop
5	Proto-Germanic	fulką	people; tribe
6	Proto-Indo-European	pleh₁-	to fill

Every word from Proto-Indo-European pleh₁- →Every word from Proto-Germanic fulką →Every word from Proto-Slavic pъlkъ →