Isabell Willan (née Harper; 1543 – June 16, 1602) was the 13th great-grandmother of Cometan, classified as one of Cometan’s distant paternal ancestors in the McKerney family line. Born in Dent, Yorkshire (in modern-day Cumbria), Isabell is mainly known as the wife of Robert Willian (1543 – 1614) with whom she had at least one son named Edmund in 1573 who connects Isabell to Cometanic ancestry.
In Cometanic ancestry, Isabell is categorised as part of the 15th generation retrograde, classifying her as a distant ancestor of Cometan.