Clapson Family History
Clapson Surname Meaning
The examples in Lincs and Norfolk are probably variants of Clappison, a Yorks surname that had begun to move south before the end of the 16th century.
The Kent and Sussex surname is found too early for it to be the same name, so it probably has a different, so far unexplained origin.
Patronymics in -son are uncommon in southern counties unless brought in by northern migrants.
Source: The Oxford Dictionary of Family Names in Britain and Ireland, 2016
