The name Welton or Welleton from the Dooms day Book, means Town or Ton where the Water/Well was
This small Town/Village of Welton is still there on the Humber River where the People of Welton first came into England.. from other lands
The People of the Village of Welton are the Welton's, they followed the Roman Road south , where "Manor's of Welton" were established along that road.
They migrated south and then from England to other Country's
People back in the 1100's did not have surnames, they were "The People of the Village, many surnames developed from a certain occupation like Carpenter , Smith (Blacksmith) etc