onomastic

adjective

1. of or relating to proper names.
2. of or relating to onomastics.
3. Law. (of a signature) written in the handwriting other than that of the document, instrument, etc., to which it is appended.

adjective

1. of or relating to proper names
2. law denoting a signature in a different handwriting from that of the document to which it is attached

adj.1716, from French onomastique (17c.), from Greek onomastikos “of or belonging to naming,” from onomastos “named,” verbal adjective of onomazein “to name,” from onoma “name” (see name).