Where does “Comintern” come from?

Comintern comes from Russian Коммуни́сти́ческий Интернациона́л, a compound of Russian коммунисти́ческий meaning communist.

Ancestry of “Comintern”, step by step

Step	Language	Word	Meaning
1	Russian	Коминте́рн	—
2	Russian	коммунисти́ческий	—
3	Russian	коммуни́ст	—
4	French	communiste	communist; Communist
5	French	commun	common; communal
6	Italian	commune	Obsolete form of comune
7	Latin	commūnis	—
8	Old Latin	com(m)oinis	—
9	Proto-Italic	kommoinis	—
10	Proto-Indo-European	ḱom-moy-ni-	held in common
11	Proto-Indo-European	ḱóm	beside, near, by, with
12	Proto-Indo-European	ḱe	Deictic particle, here; Post-positional...
13	Middle English	kyt	—
14	German	kitt	—
15	Old High German	kuti	—
16	Proto-West Germanic	kwidu	gum, resin
17	Proto-Germanic	kweduz	resin
18	Proto-Indo-European	gʷet-	resin, gum; to say, speak
19	Proto-Indo-European	gū-	to bend; curve; arch; vault; to bow, bend, arch,...

Comintern — Etymology, Origin & Word History | Etymology Explorer