Where does “cum ipsa” come from?

cum ipsa (Latin) comes from Latin ipsa, from Latin ipse, from Proto-Italic *e(s)peso.

Ancestry of “cum ipsa”, step by step

Step	Language	Word	Meaning
1	Latin	ipsa	nominative feminine singular of ipse; nominative...
2	Latin	ipse	himself, herself, itself, the very, the actual;...
3	Proto-Italic	*e(s)peso	—

cum ipsa — Etymology, Origin & Word History | Etymology Explorer