Persei
Persei is a Latin form of Perseus, meaning “Perseus, son of Jupiter and Danae, who killed the Gorgon; Perseus, last king of Macedon”. It is the genitive singular masculine noun.
Found 56 times in the Latin texts on Socratos.
Where it is used
Ovid, Metamorphoses 5.201: miles erat Persei, pro quo dum pugnat, Aconteus,
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.