松井 大輔 (Matsui Daisuke) is the full name of Daisuke Matsui in Japanese. The surname, Matsui, is written first, followed by the given name, Daisuke. The characters for Matsui mean "pine tree" and "well," while the characters for Daisuke mean "big" and "help."
Daisuke Matsui Knowledge Challenge: Are You Up for the Test?