— where you saw this font name, what it looks like, or any other associated words — I can give a more precise answer. Otherwise, it's highly likely a typo or a non-public font.
Before you download "sutonnymj font for android," remember: sutonnymj font for android
If you want SutonnyMJ to replace your entire Android system font (interface, notifications, keyboard previews), you will need and a custom font manager like zFont (no root option available) or manually replacing fonts. — where you saw this font name, what