descendent, issue, offspring
胤 centers on the continuation of a bloodline: a descendant, offspring, or issue that carries forward a family line.
胤 combines 月 (flesh/body) with 幺 (thread) and 儿 (legs), suggesting a thread of flesh continuing through descendants. The exact historical development is uncertain, but the component combination likely expresses lineage.
The left side 月 represents flesh or body, while the right side 幺 (thread) over 儿 (legs) looks like a thread being passed down. Imagine a family thread woven through generations, each descendant a new strand.
For イン, picture an inn where a family line continues: inn -> イン, and each descendant stays at the same ancestral inn.
issue; offspring; paternal blood
to become pregnant with an illegitimate child
descendant; scion
Imperial descendant (posterity)
successor; descendant
illegitimate child (usu. of a nobleman)
nobleman's illegitimate child
lineage; stock; descent; strain; blood relationship