The McCowan Family
An historical and photographic perspective
Recent DNA results from Family Tree indicate that the mtDNA haplogroup for the Waugh - McCowan female line is HV0d-G15110A. That line is from my daughter to her mother to Catherine McCowan to Agnes Swan Fairley to Annie Swan Wilson to Agnes Swan to Agnes McDonald to Christian Philip (b. about 1800) (as far as our genealogical research indicates).
Acording to Familytreedna "Mitochondrial haplogroup HV is a primarily European haplogroup that underwent an expansion beginning approximately 20,000 years ago. It is more prevalent in western Europe than in eastern Europe, and descendant lineages of the original haplogroup HV appear in the Near East as a result of more recent migration.
One of the dominant mitochondrial
haplogroups in Europe,
Future work will better resolve the distribution and historical characteristics of this haplogroup."
They took refuge in Mediterranean Europe during the last ice age. They then spread into the rest of Europe after the glaciers retreated.
Haplogroup HV is a west Eurasian haplogroup found throughout West Asia and Southeastern Europe, including Iran, Anatolia (present-day Turkey) and the Caucasus Mountains of southern Russia and the republic of Georgia. It is also found to a much lesser extent in parts of East Africa, mainly in the population of Sudanese Arabs, where the frequency of Eurasian ancestry is 22.5%, and a very high frequency of Y-chromosome Haplogroup J (Y-DNA) is also found.
Much earlier, around 30,000 years ago, some members of HV moved north across the Caucasus Mountains and west across Anatolia, their lineages being carried into Europe for the first time by the Cro-Magnon. However Cro-Magnons are supposed to have arrived earlier and their lineages might be from Gravettians. Their arrival was the second group(s) of anatomically modern humans in Europe (the first being mtDNA haplogroup U5).  These continued migrations sounded the end of the era of the Neandertals, a hominid species that inhabited Europe and parts of western Asia from about 230,000 to 29,000 years ago.  Better communication skills, weapons, and resourcefulness probably enabled them to outcompete Neandertals for scarce resources. Importantly, some descendants of HV had already broken off and formed their own group, haplogroup H, and continued the push into Western Europe. 
A 2003 study was published reporting on the mtDNA sequencing of the bones of two 24,000-year-old anatomically modern humans of the Cro-Magnon type from Southern Italy. The study showed one was of either haplogroup HV or R0.