Θαλῆς

Ancient Greek

Perhaps from θᾰ́λλω (thắllō, “to thrive”) +‎ -ης (-ēs), in which case “one who thrives”.

Θᾰλῆς • (Thălês) m (genitive Θᾰλέω or Θᾰλοῦ); first declension
Θᾰλῆς • (Thălês) m (genitive Θᾰλῆτος); third declension

First declension of ὁ Θᾰλῆς; τοῦ Θᾰλέω (Attic)

Case / #	Singular
Nominative	ὁ Θᾰλῆς ho Thălês
Genitive	τοῦ Θᾰλέω / Θᾰλοῦ toû Thăléō / Thăloû
Dative	τῷ Θᾰλῇ tōî Thălēî
Accusative	τὸν Θᾰλῆν tòn Thălên
Vocative	Θᾰλῆ Thălê
Notes:	This table gives Attic inflectional endings. For declension in other dialects, see Appendix:Ancient Greek dialectal declension.

Third declension of ὁ Θᾰλῆς; τοῦ Θᾰλῆτος (Attic)

Case / #	Singular
Nominative	ὁ Θᾰλῆς ho Thălês
Genitive	τοῦ Θᾰλῆτος toû Thălêtos
Dative	τῷ Θᾰλῆτῐ tōî Thălêtĭ
Accusative	τὸν Θᾰλῆτᾰ tòn Thălêtă
Vocative	Θᾰλῆς Thălês
Notes:	This table gives Attic inflectional endings. For declension in other dialects, see Appendix:Ancient Greek dialectal declension. Nominative singular -ς (-s) arose by reduction of the original cluster *-ts.

“Θαλῆς”, in Liddell & Scott (1940) A Greek–English Lexicon, Oxford: Clarendon Press
“Θαλῆς”, in Liddell & Scott (1889) An Intermediate Greek–English Lexicon, New York: Harper & Brothers
Woodhouse, S. C. (1910) English–Greek Dictionary: A Vocabulary of the Attic Language‎^[1], London: Routledge & Kegan Paul Limited, page 1,027