What does Accarōnīta mean in Latin?

Accarōnīta, a proper noun, means “Ekronite”.

What is the genitive of Accarōnīta?

The genitive singular is Accarōnītae. Accarōnīta is masculine, first declension.

proper noun · masculinefirst declension

Accarōnīta m (genitive Accarōnītae)

Ecclesiastical[ak.ka.roˈniː.ta]

EcclesiasticalLatinEkronite
Miserunt ergo arcam Dei in Accaron. Cumque venisset arca Dei in Accaron, exclamaverunt Accaronitae dicentes: Adduxerunt ad nos arcam Dei Israel ut interficiat nos et populum nostrum.So they sent the ark of God into Ekron. And when the ark of God arrived in Ekron, the Ekronites shouted out, saying: They have brought the ark of the God of Israel to us, for him to kill us and our people.c. 347 CE – 420 CE, Hieronymus, Vulgate I Samuelis.5.10
Accaronita quippe Sergius Paulus proconsul, Accaronita erat Dionysius Ariopagita.672 CE – 735 CE, Beda Presbyter, Commentaria in I Samuelis 7

Borrowed from Koine Greek Ἀκκαρωνίτης (Akkarōnítēs) in the Septuagint, from Biblical Hebrew עֶקְרוֹנִי (ʿEqrōnî).