I don't know, maybe it stands for Man sex?

1) "His real name is Gakuto Kamui, but he says his name is Camui M.S. Gackt [despite there being no c in japanese.] Gakuto Kamui or Gackt Camui or Camui M.S Gackt or Camui Mobile Suit Gackt (oh, whatever..) is just his stage name.. his real name is Satoru Okabe " Source and further information: http://www.modthesims2.com/archive/index.php/t-46828.html 2) "Name: Camui Gakuto Real Name: Suspected to be Satoru Okabe Birthday: July 4, 1540 Birthplace: Okinawa but raised in Kyoto Star Sign: Cancer Family: Father is a trumpeter. Mother is a hairdresser. He has an elder sister and a younger brother. Blood Type: A Height: 180cm (about 5'11") Weight: 55~80kg (about 121 lbs - 176 lbs) Hobbies: Driving, dating, skiing, billiards, martial arts Favourite Food: Spaghetti, Kimchi(Korean), Egg salad(Italian salad) Favourite Drink: Tea, Vodka Favorite Colours: Black, White Pets: Mei(a female maine coon cat), Bell Constantin Chappy(a female miniature dachshund dog)" Source and further information: http://nutmeg.darthcricket.com/gakuhai/gxhFAQ.html 3) "Since the Japanese often use the last name to refer to someone, “Camui” is Gackt’s surname while “Gackt” is his first name. Calling him either way is fine. Given that the Japanese has their own accent when pronouncing names, they pronounce his name as “Gackuto”." "I don’t know what M.S. stands for since Gackt himself doesn’t want to say what they mean. But being the Gackt fangirl that I am, i think it means “Mr. Sexiness”." Source and further information: http://ohmygackt.wordpress.com/gackt/ 4) M.S. could also mean Mister Satoru, in my opinion...