Lewis & Short

Sȳ̆chaeus (Sych-, Verg. A. 1, 343; also Sĭchaeus), i, m., Sychæus, husband of Dido, Verg. A. 1, 343; 1, 720; 4, 20; 4, 502; 4, 632; 6, 474; Ov. H. 7, 97 sq.
Hence, Sy-chaeus, a, um, adj., of Sychæus, Verg. A. 4, 552.