Mathisen believes, "the name of Aegidius' son, Syagrius, may imply relations, "to the Syagrii of Lyons" (Wikipedia). MacGeorge (2002), makes a similar statement, but adds that if a relation does exist, it could also be through marriage... instead of blood.
Sources
MacGeorge, P. (2002). "The career of Aegidius." Late Roman Warlords. Oxford University Press. eBook.[1]