What does Sūtrius mean in Latin?

Sūtrius, a adjective, means “of Sūtrium”.

How do you pronounce Sūtrius?

In classical Latin, [ˈsuː.tri.ʊs]; in ecclesiastical (church) Latin, [ˈsuː.tri.us].

adjectivefirst/second-declension adjective

Sūtrius (feminine Sūtria, neuter Sūtrium)

Classical[ˈsuː.tri.ʊs]Ecclesiastical[ˈsuː.tri.us]

singular
form	masculine	feminine	neuter
nominative	Sūtrius	Sūtria	Sūtrium
genitive	Sūtriī	Sūtriae	Sūtriī
dative	Sūtriō	Sūtriae	Sūtriō
accusative	Sūtrium	Sūtriam	Sūtrium
ablative	Sūtriō	Sūtriā	Sūtriō
vocative	Sūtrie	Sūtria	Sūtrium

plural
form	masculine	feminine	neuter
nominative	Sūtriī	Sūtriae	Sūtria
genitive	Sūtriōrum	Sūtriārum	Sūtriōrum
dative	Sūtriīs	Sūtriīs	Sūtriīs
accusative	Sūtriōs	Sūtriās	Sūtria
ablative	Sūtriīs	Sūtriīs	Sūtriīs
vocative	Sūtriī	Sūtriae	Sūtria

From Sūtrium (“an ancient town in Etruria, Sutri”).