I’m reminded that Cutlock isn’t the only rare name in the family tree, at least as judged by the Ancestry website surname look-up feature. This uses the 1891 census records (England and Wales), showing a distribution map at county level (of people, not families as it states).
Cutlock – 10 people, all in Norfolk. The one who was born in London has married in.
Laddiman – 9 people, all in Norfolk.*
I have the impression that there are now more Laddimans than Cutlocks, given the prevalence of female offspring in the latter.
Any bidders for greater exclusivity at 1891 (excluding transcription/spelling errors, please!)?
* Laddiman on the other hand is clearly connected to variations on the name Liddiman, and also Liddiment (need to find my notes on that last one).