To use Sutonnymj as an Android system font, you need a Unicode-compatible version of Sutonnymj. Developers have modified the original font to map correctly to Unicode standards while retaining the Sutonnymj style. When searching for the file, ensure you are downloading a version often labeled as "Sutonnymj Unicode" or "Sutonnymj.ttf" specifically optimized for Android system usage.
If you remember the font style (script, bold, handwritten, futuristic), that will help narrow it down. sutonnymj font for android