Where does “trānsmigrō” come from?

trānsmigrō (Latin) comes from Latin migro, from Proto-Italic migrāō, from Proto-Indo-European h₂migʷ-.

Ancestry of “trānsmigrō”, step by step

Step	Language	Word	Meaning
1	Latin	migro	I migrate, depart to another place, change...
2	Proto-Italic	migrāō	—
3	Proto-Indo-European	h₂migʷ-	—

trānsmigrō — Etymology, Origin & Word History | Etymology Explorer