Λάρισος
Could not find Λάρισον in Logeion dictionaries.
Λάρισον Proper-name noun: masculine accusative singular of Λάρισος
Λάρισος — Larisos R. (Achaia), Pleiades 570415
Λάρισος -ου, ὁ Larisos, river between Elis and Achaia Xen. Hel. 3.2.23 etc.
Λάρισος ou Λάρισσος, ου (ὁ) Larisos, fl. entre l’Élide et l’Achaïe, Xén. Hell. 3, 2, 23 ; Plut. Phil. 7.