Growing up with a name like Takeharu (yes, that's my real whole first name) followed by a Toyoshima, I had trouble finding my name on key chains at the souvenir shop. I was always jealous of people with "simpler", shorter names like John, Bob and Matt. There was this one Chinese kid who I hated named Ed Ng. I always thought he had an unfair advantage during tests where we could start as soon as we finish writing our names.
Kids started calling me "Tak" sometime in the 5th-6th grade, I think. They actually started to call me "Rock" being that I had such a chiseled, Roman God-like physique. "Rock" became "Tak" and it stuck ever since. Over the years I came to learn Tak is a rather common nickname for any Japanese name that starts with a "Tak". But as far as I know I'm the only Takeharu Toyoshima in the universe and that's OK by me.