LAT

Lewis Short

Hylas (noun M) : Ὕλας
* A beautiful youth of Oechalia (or Argos), companion of Hercules in the Argonautic expedition, who was carried off by the nymphs, and long sought for by Hercules in vain, Prop. 1, 20, 6; Ov. A. A. 2, 110; Juv. 1, 164; Val. Fl. 3, 596; Hyg. Fab. 14; Verg. E. 6, 44 (where, by poet. license, the voc. is scanned Hylā, Hȳl', like the Gr. Ἆρες, Ἄρες, Mart. 9, 11, 15).
Charlton T. Lewis, Charles Short, A Latin Dictionary

PIR

Male Personal name
Confirmed occurences in the Roman Empire:
Prosopographia Imperii Romani
memory