Belga
From LSJ
ἡ κέρκος τῇ ἀλώπεκι μαρτυρεῖ → you can tell a fox by its tail, small traits give the clue to the character of a person
Latin > French (Gaffiot 2016)
Belga, æ, et Belgæ, ārum, m., Belge, Belges, habitants de la Gaule belgique (au N. de la Gaule celtique) : Luc. 1, 426 ; Cæs. G. 1, 1, 1 || -ĭcus, a, um, des Belges, belge : Virg. G. 3, 204.