Tessa f
English: this name and its shortened form Tess are generally considered to be pet forms of THERESA (SEE Theresa), although now often used independently. However, the formation is not clear, and Tessa may be of distinct origin. Literary contexts of the late 19th century show that the name was thought of as Italian, although it is in fact unknown in Italy.
Pet form: Tessie.
First names dictionary. 2012.