Watmough Name Meaning
From the Middle English personal name Wat a pet form of Walter and Middle English maugh mough ‘kinsman by marriage brother-in-law son-in-law’. See Mowe (1) and compare Robert Waltersmaghe 1305 in Black. In origin it was mainly a Lancs surname that spread eastwards and southwards in post-medieval times. Redmonds Dictionary of Yorks Surnames notes that in 1634 Joshua Watmough of London granted land to a man from Bradford (WR Yorks) and was described as ‘a younger son of Hugh Watmough late of Bury’ (Lancs).
Source:
The Oxford Dictionary of Family Names in Britain and Ireland, 2016
Similar surnames:
Warmouth, Waugh, Stough, Tough, Weymouth, Warmuth, Garlough, Warmoth
From: https://www.ancestry.co.uk/learn/facts