That Mr. Orcutt's DNA sample and that of the Urquhart sample to which he compared his do not match may or may not mean that Urquharts and Orcutts are related.
One cannot assume that all of a single name have a single genetic derivation (well, other than Adam or Noah, I suppose).First, fixed surnames are a relatively recent occurrence, particularly in parts of Scotland. Secondly, it was common in Scotland to adopt the name of the local laird/chief/region.Third, the same surname may be adopted by more than one group.The Cook DNA testing has shown many different groups.Clearly, we are not all related.OTH, some of us are.
It may turn out that Orcutt and Urquhart have nothing in common.There is insufficient information at this point.
Mr. Orcutt encourages a DNA study for the name.As a bystander, I would join in that suggestion.However, it should not be just the 12 allele test.This is really only good for ruling out relationships.The better test would be the 25 marker test if you are wishing to show relationships. Who knows, you may turn out to all be Cooks (or the other way around)!