Hello.
Your hairdresser's name sounds very Japanese, indeed, so I looked it up in my Japanese dictionary.
Results:
実 = mi meaning 'fruit; matter, essence'
実る = minoru = to bear fruits, to ripen. Ta-da!!
Also it has other readings and meanings as jitsu=truth, reality; makoto=truth, honesty; sane=core, seed.
Archaic form of this character is 實.
Then I looked it up in Chinese dictionary and found a reading shi (rising tone), but no meaning. Then I looked up the archaic form and it seems to become 实 [shí] concrete, accurate, in actual fact, kernel.
Thank you for the quest!