ETYMOLOGY
perhaps the same as Tib, a shortened hypocoristic form of the female name Isabel; now rather rude or slighting (except playfully);
also with dim. -y or -ie, Tibbie, a common female name in the north
EXAMPLE
“… .Trupeny. Mary then prickmedaintie come toste me a fig,
Who shall then know our Tib Talke apace trow ye?
An. Alyface. And why not Annot Alyface as fyne as she?
Trupeny. And what had Tom Trupeny, a father or none?
An. Alyface. Then our prety newe come man will looke to be one …”
From: Ralph Roister Doister
By Nicholas Udall, a1556
Lexicophilia 