From BiblePortal Wikipedia

Hastings' Dictionary of the Bible [1]

Rasses . A people subdued by Holofernes ( Jdt 2:23 ).

International Standard Bible Encyclopedia [2]

ras´ēz ( Ῥαασσείς , Rhaasseı́s , Codex Alexandrinus and Codex Vaticanus, Ῥασσείς , Rhasseı́s  ; Vulgate (Jerome's Latin Bible, 390-405 A.D.) Tharsis  ; Old Latin Thiras et Rasis ): The children of Rasses are mentioned with Put, Lud and the children of Ishmael as having been subdued by Holofernes (  Judith 2:23 ).

Their identity is a matter of conjecture only. Some think Vulgate (Jerome's Latin Bible, 390-405 A.D.) Tharsis (= Tarsus) is meant, others Rosh (  Ezekiel 38:2 ,  Ezekiel 38:3;  Ezekiel 39:1 ), others Rhosos, a mountain range and city South from Anunus, on the Gulf of Issus. Most probably a district, not a town, is named, situated in the eastern part of Asia Minor.