Which clan do the williamson belong to?

The Williamsons belong to the Clan MacWilliam, which is a Scottish clan historically associated with the region of Moray. The clan's name is derived from the Gaelic "Mac Uilleim," meaning "son of William." The MacWilliams were once prominent in the area during the medieval period, though the clan's influence has diminished over time. Today, the surname Williamson is more widely recognized and can be found across various regions.