Fromoto (乙,younggirl,youngest girl) +ko (子,child,kid).

乙(おと)子(ご)• (otogo) 

1. lastchild

• “^△乙子”, in漢字ぺディア [Kanjipedia]‎^[1] (in Japanese),The Japan Kanji Aptitude Testing Foundation,2015–2025

• Japanese terms spelled with 乙 read as おと
• Japanese terms spelled with 子 read as こ
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