Sorry, couldn't find any words matching otouto.
You can also try a search for おとうと.
More reading
- Tae Kim's Guide to Learning Japanese: Addressing People
- imabi: Nouns and Pronouns
Names — 4 found
おとうとがわ
【弟川】
1. Otoutogawa
おとうとじま
【弟島】
1. Otoutojima
おとうとじませと
【弟島瀬戸】
1. Otoutojimaseto