Where does “chirographum” come from?

chirographum (Latin) comes from Ancient Greek κειρόγρᾰφον, from Ancient Greek κειρόγρᾰφος — handwritten.

Ancestry of “chirographum”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	κειρόγρᾰφον	—
2	Ancient Greek	κειρόγρᾰφος	handwritten

chirographum — Etymology, Origin & Word History | Etymology Explorer