What does Phoebēus mean in Latin?

Phoebēus, a adjective, means “Phoebean; Apollinean”.

How do you pronounce Phoebēus?

In classical Latin, [pʰoe̯ˈbeː.ʊs]; in ecclesiastical (church) Latin, [feˈbɛː.us].

adjectivefirst/second-declension adjective

Phoebēus (feminine Phoebēa, neuter Phoebēum)

Classical[pʰoe̯ˈbeː.ʊs]Ecclesiastical[feˈbɛː.us]

singular
form	masculine	feminine	neuter
nominative	Phoebēus	Phoebēa	Phoebēum
genitive	Phoebēī	Phoebēae	Phoebēī
dative	Phoebēō	Phoebēae	Phoebēō
accusative	Phoebēum	Phoebēam	Phoebēum
ablative	Phoebēō	Phoebēā	Phoebēō
vocative	Phoebēe	Phoebēa	Phoebēum

plural
form	masculine	feminine	neuter
nominative	Phoebēī	Phoebēae	Phoebēa
genitive	Phoebēōrum	Phoebēārum	Phoebēōrum
dative	Phoebēīs	Phoebēīs	Phoebēīs
accusative	Phoebēōs	Phoebēās	Phoebēa
ablative	Phoebēīs	Phoebēīs	Phoebēīs
vocative	Phoebēī	Phoebēae	Phoebēa

Phoebēus, a, um, v. Phoebus, B.

Borrowed from Ancient Greek Φοίβειος (Phoíbeios), from Φοῖβος (Phoîbos) + -ειος (-eios). By surface analysis, Phoebus + -ēus.