The Pocomtuc were an indigenous American people from the New England region of the present-day United States. Isolt Sayre’s Squib daughter Martha married a No-Maj Pocomtuc man who was the brother of a Sayre-Steward family friend (Pm).
The Potomuc have not been a recognized tribe for a long time, and historical information about them is fairly scarce, according to Wikipedia.
From the Web
A collection of Internet resources about the Pocumtuc from the Native Languages of the Americas website.