Σιλᾶς

• Σῑ́λᾱς (Sī́lās) — biblical
• Σειλᾶς (Seilâs), Σεειλᾶς (Seeilâs), Σηλέος (Sēléos), Σηλαῖος (Sēlaîos), Σῑλαῖος (Sīlaîos)

Borrowed from Aramaic שְׁאִילָא (šəʾīlā). Compare Hebrew שָׁאוּל (sha'úl).

Σῑλᾶς • (Sīlâs) m (genitive Σῑλᾶ); first declension

1. a male given name from Aramaic, equivalent to English Silas

• Aramaic nouns ending in aleph were commonly borrowed into Ancient Greek as first declension masculine nouns, hence the ending -ᾶς (-âs).
• Biblically attested both as Σῑ́λᾱς (Sī́lās) and Σῑλᾶς (Sīlâs).

• Greek: Σιλάς (Silás), Σίλας (Sílas)
• → Latin: Sīlās (see there for further descendants)

• G4609 in Strong, James (1979), Strong’s Exhaustive Concordance to the Bible
• Moulton, W. F.; Marshall, I. Howard (June 2002). A Concordance to the Greek Testament (Greek). T. & T. Clark Publishers, 6th Ed. pp. 974.