Hi,
My SEAR(E) line is mostly in Bucks near the Beds border.
Johanna SEAR who married George ROLLINGS in 1802 in Eaton Bray, Beds. was christened in 1787 in Cheddington, Bucks. She was apparently an only child. Her parents Joseph SEAR & Rebecca TATHAM were mar in Wing in 1785. He was son of Samuel SEARE & Ann PRETTY chr in Mentmore in 1764.
Samuel & Ann also mar in Wing in 1748. Samuel chr Cheddington in 1720 was son of Thomas SEARE & Elizabeth SEABROOKE married 1708 Whitchurch, Bucks. From here it is mostly Cheddington back through the 1600s. The reseach from marriage of Thomas & Elizabeth back was someone else's and I am accepting but haven't gotten into the records to be sure there are no alternatives.
If it looks like your family fits in, let me know and I will give you more info.
It would help if you gave a date and location of the earliest on each surname or at least a time frame.
Charlotte