Mainly U.S.: transferred use of the surname, adopted in honour of George Mifflin Dallas, Vice-President 1845–49, after whom the city in Texas is named. The surname is of Scottish origin, derived from the village of Dallas in Morayshire, named in Gaelic as Dalfhas ‘meadow stance’, i.e. a meadow traditionally used as a night's resting place by cattle drovers.
English: habitational name from Whaley in Derbyshire, Whalley in Lancashire, or Whaley Bridge in Derbyshire (formerly in Cheshire). The first is probably named with Old English wælla ‘spring’, ‘stream’ + lēah ‘(woodland) clearing’. The second has as the first element Old English hwæl ‘round hill’, and the last has Old English weg ‘path’, ‘road’ as the first element, the second element in both cases also being lēah.