LATIN DICTIONARYLexicon Latīnum
proper noun · masculinefirst declension

Achillās

Achillās m sg (genitive Achillae)
Classical[aˈkʰɪl.laːs]Ecclesiastical[aˈkil.las]

Meaning

  1. EcclesiasticalLatina male given name from Ancient Greek, of historical usage, notably borne by Saints Achillas of Alexandria and Achillas of Larissa
    Magnum Achillam appellat Athanasius, orat. a contra Arianos, ut inquit Baronius in Notis ad Martyrologium.Athanasius calls him Achillas the Great, in the first discourse against the Arians, as Baronius says in his Notes on the Martyrology.1751, Jean-Baptiste du Sollier, “Tractatus Praeliminaris […] ad tom. v. Junii de Patriarchis Alexandrinis”, in Praefationes, Tractatus, Diatribae et Exegeses Praeliminares […] , volume 3, page 32:

Declension

declension
formsingularplural
nominativeAchillās—
genitiveAchillae—
dativeAchillae—
accusativeAchillam—
ablativeAchillā—
vocativeAchillā—

Ăchillas, ae, m.,
I. the murderer of Pompey, Caes. B. C. 3, 104; 108; Luc. 8, 538.

Origins

Borrowed from Ancient Greek Ἀχιλλᾶς (Akhillâs).

In the Academy Smith's classical dictionaries

Quick answers

What does Achillās mean in Latin?
Achillās, a proper noun, means “a male given name from Ancient Greek, of historical usage, notably borne by Saints Achillas of Alexandria and Achillas of Larissa”.
What is the genitive of Achillās?
The genitive singular is Achillae. Achillās is masculine, first declension.
How do you pronounce Achillās?
In classical Latin, [aˈkʰɪl.laːs]; in ecclesiastical (church) Latin, [aˈkil.las].