Λέπτις
Could not find Λέπτιν in Logeion dictionaries.
Λέπτιν Proper-name noun: feminine accusative singular of Λέπτις
Λέπτις -εως, ἡ Leptis, African city Plut. Sollert. 983f.
Λέπτις, εως (ἡ) Leptis (auj. ruines près de Khoms) v. sur la côte de la Grande Syrte, Plut. Sol. an. 35.