Where does “ундека́н” come from?

ундека́н (Russian) comes from German Undecan, from German an, from Middle High German āne, from Old High German āna, from Proto-West Germanic ana, from Proto-Germanic *an, from Proto-Germanic ana, from Proto-Indo-European h₂en- — on, onto.

Ancestry of “ундека́н”, step by step

Step	Language	Word	Meaning
1	German	Undecan	undecane
2	German	an	on; upon; at; in; against; by; near; close to;...
3	Middle High German	āne	without
4	Old High German	āna	without
5	Proto-West Germanic	ana	on
6	Proto-Germanic	*an	—
7	Proto-Germanic	ana	on, at; on, onto; ana
8	Proto-Indo-European	h₂en-	on, onto

Words derived from “ундека́н”

ундекан

Every word from Proto-Indo-European h₂en- →Every word from Proto-Germanic ana →Every word from Proto-Germanic *an →