Gwilym, Guilielm, Guillaume, Gullam, Gwilliam, Wilhelm, Wilson, Willimon, Williman, Williamson, Whilly, Whillie, Willis, Williamsen
Williams Of Wales - 'Son of William'
Anglicised today but derived from the French/Germanic name Wilhelm, a combination of the words "will" and "helmet", brought by the Normans. The Welsh adopted it as Guilielm and Gwilym, becoming Gwilliam and Gullam. Thought to be the 2nd most popular surname in Wales. In use worldwide through migration from Wales, predominant in Wales in Caernarfonshire and Ynys Mon (The Isle Of Anglesey), its a popular name all over Wales and the English speaking world today through Welsh migration.
Williams is the second most popular surname in New Zealand and possibly the 3rd most popluar surname in the USA! You are a big family indeed! Welsh Williams settlers were in the US from 1620, Canda from 1750 and in New Zealand & Australia from 1820...