Just thinking that too!
There is this entry for example in 1851:
Andrew Robison 26, Ironstone Miner, Kirkmichael, Ayrshire
Sarah Robison 20 wife, b. Ballantrae, Ayrshire
Agnes Robison 6 b. Coylton, Ayrshire
William Robison 5 b. Coylton, Ayrshire
Address: 29 Waterside V, Waterside, Dalmellington
Robertson/Robson/Robinson etc would all be surname variants.
Monica
PS: Welcome to RootsChat, crobertson