Oops sorry, someone told me it was Fann's sister...
Anyway, here the origin's of Toro's name:
A few years ago when Toro was still in Energy, he got his name from
his actual name.
His actual name is 郭苇昀 Guo Wei Yun.
Wei Yun sounds like Wei Yu 鲔鱼, which is tuna.
In Japanese tuna is マグロmaguro, but the meat from the stomach area
is とろtoro.
hence his name in showbiz is Toro.
(Ppl might laugh if his name is Maguro! Somemore that time he in
Energy, all the rest 2 syllable names then his name sounds very
extra..)