Lewis & Short

Sēja or Seia, ae, f. [from seg, seges], the Roman tutelary goddess of sowing (as Semonia, of the seed, and Segesta or Segetia, of standing crops in gen.), Macr. S. 1, 16; Plin. 18, 2, 2, § 8; 36, 22, 46, § 163; Aug. Civ. Dei, 11, 8; cf. Sesia, and Becker, Antiq. vol. 4, p. 15.