Calder

1. Scottish: habitational name from any of the various places called Calder, Caldor, or Cawdor. Calder in Thurso is recorded in the early 13thcentury in the form Kalfadal and was named with Old Norse kalfr ‘calf’ + dalr ‘valley’. The others are probably the same as in 2 below.
2. English: habitational name from Calder in Cumbria, named from the river on which it stands. This is probably a British name, from Welsh caled‘hard’, ‘violent’ + dwfr ‘water’, ‘stream’.