Calder comes from an English and Scottish surname though with two very different origins. The first is that it comes from a place name in Cumbria, deriving its name from a nearby river, possibly made up of Welsh caled (hard) and dwfr (water, stream) both derived from a PIE source, so the name essentially means "hard water" …


Dalton comes from an English surname derived from a place name meaning "valley town" or "valley enclosure" from Old English elements dael (dale, valley) ultimately deriving from Proto-Germanic *dalan (curve, arch); and tun (enclosure, settlement). Origin: Proto-Germanic, Old English  


Dale comes from an English surname meaning "dale" or "valley" from Old English dael (dale, valley) derived from Proto-Germanic *dalan (curve, arch). Origin: Proto-Germanic