The Whole North Into Gaul

[Flavivs Aetivs]

So I was working on my section on the Army of Aetius, and I know the Notitia presents evidence of Barbarians being recruited as monpower for Roman units:

Salii
Heruli Seniores
Equites Heruli Iuniores

However, there is one unit that intrigues me:

Lanciarienses Sabarienses

The second name sounds like it dervies from a Hunnic Tribe (The Sabirs). The Sabirs weren't on the Roman border at this time (they were in the caucasus... )

But the name sounds like it's based on Hunnic (Proto-Turkic): question is, could they have been Hunnic?

The Huns are recorded as being skilled with the Javelins, but they weren't infantrymen...

However, in the East there is this unit:

Equites catafractarii Biturigenses

That sounds a lot like the Bittugur Huns (one of the Groups under Attila that followed his sone Dengzich).

Thoughts on this unit as well?