Where does “pharetratus” come from?

pharetratus (Latin) comes from Latin pharetra, from Ancient Greek φαρέτρα, from Ancient Greek φέρω, from Proto-Hellenic pʰérō, from Proto-Indo-European bʰéreti, from Proto-Indo-European bʰēr- — shiny, light brown.

pharetratus (Latin): equipped with or wearing a quiver, quivered