If it's too long people might use In English: Mike In English: Mick
For the opposite sex use: In Ukrainian: Mikayla (F) In Scandinavian: Mikaela (F) In Russian: Mikhaila (F) In Romanian: Mihaela (F) In Italian: Micaela (F) In Italian: Michela (F) In French and in English: Michelle (F) In French: Michele (F) In English, German, Czech and in the bible: Michael (M) In English, German and in Czech: Michaela (F)
See also In Russian: Misha (B) In Italian: Michelina (F) In French and in German: Michel (M) In French: Micheline (F) In Esperanto: Michjo (M) In English: Miles (M)