The meanings of Wanshu(Wansu or Wunsu) are Strong Arm, Dragon Boy or Dumping Form.
There is no direct translation to the word, be cause Wanshu is a name. The kata is thought to have been composed by Okinawans as a tribute to a Chinese emmissary named Seppushi Wanshu. Like many other Okinawan katas Wanshu it is shrouded in much mystery. Hope I could help!