>>280648173
This is actually just a mistranslation. This first panel apparently created a misconception in the fandom for a while. This is not the name of Sango's youngest child. The original line was actually 琥珀、子守り頼む。which means "Kohaku, watch the kids" or "Kohaku, I am entrusting babysitting to you". Komori (子守り) means "babysitting". 子守 is a name, hence, the confusion.

The kid did get a name in Yashahime, but in Inuyasha, there's no name.