Board Thread:Questions and Answers/@comment-169.231.121.206-20140221192840/@comment-108.204.144.54-20140501220255

The "Shing" part is from being adopted by the Shing family, (Britannian family btws the blonde girl Shin was with is his adopted younger sister, Alice Shing), Hyuga is his original surename, so as of now, they are known to be full brothers.