Reb.

Reb. is a clerk's shortening of the given name Rebecca. Busy writers cut common first names down to a few letters, often raising the last letters above the line, and the habit runs through deeds, wills, tax lists and census pages.

The name was spelled Rebecca, Rebekah and other ways, and the short form hides which one the family chose. Search under each spelling, and do not split one woman into two people because the spelling changes.