Sir Thomas Welch (also spelt as Walch; c. 1602 – ????) was the 11th great-grandfather of Cometan, classified as one of Cometan’s distant paternal ancestors in the Stringfellow family line. Born in Blackburn in Lancashire, Sir Thomas is known to have been the son of Elizabeth Livesey (1582 – 1660) and the father of Sir John Welch (1622 – 1681). The details of Sir Thomas’ death remain unknown as is the identity of his father.
In Cometanic ancestry, Sir Thomas is categorised as part of the 13th generation retrograde, classifying him as a distant ancestor of Cometan.