Late Roman Unit Sizes

[Flavivs Aetivs]

Germanic tribal identity was fluid, it's possible many still existed as Cantons but aren't mentioned because they were under a greater identity like Salii or Iuthungi

It's thought that the Lemovii went on to form the Rugii of Eugippiu, for example.

EDIT: It's clear that a number of units named after tribes were not recruited from them. The Heruli are a good example, being stationed in Gaul in the 4th century, while the Heruli were at that time bordering the Black Sea East of the Dniester.