Elijah

The son of Desmond Miles and an unknown woman (born c. 2005) was a Sage living in the New York area. On 4 October 2015, his mother brought him to an Abstergo clinic in New York, at which point Abstergo discovered he shared the patrilineal lineage of Desmond Miles. Isabelle Ardant planned to have Abstergo collect the boy at a later point for experimentation in the Animus.

Reference

 * Assassin's Creed: Syndicate – Database: Reconstructed Data #010