Quick answer
Miyu is a girl name.
Meaning and history
From Japanese 美 ( mi ) meaning "beautiful" or 実 ( mi ) meaning "fruit, good result, truth" combined with 優 ( yu ) meaning "excellence, superiority, gentleness" or 結 ( yu ) meaning "tie, bind" or 夕 ( yu ) meaning "evening". Other kanji combinations are possible.
Notes and context
Usage: japanese | Japanese Hiragana: みゆ; Japanese Katakana: ミユ