Does anyone know why Key chose his stage name to be "Key"?

its coz of 2 main reasons..1st..its easier to address him dat way n it wont b confusing as der is 1 更多 kim kibum in super junior..
and da 2nd....he loves to solve matters and things..dats y he is named as "key"..which means he "unlocks" matters..
hope it helped

Because it is the shorter version of his name It is also easier to remember and call his name(:

Wow! it is a great short name "Key". B'coz the word "Key" is just one sylable it is easy to pronounce when u'r calling him, & it's simple to remember him.

Cuz hiS real name is kim kibum so .. He just called himself key xD !! But i like it ^^ <3