>>5281705A few name ideas.
Going with the greek motif
"Laterns of Charon" - For they are like unto the guardians of the boatman, and aid both navigator, ship and crew safely over the stygian, though the shades of the damn gather round, though the beast of Cereberus grows or the winds of limbo roar, they shine the path and light the way.
https://youtu.be/jGKNaIXtBZQCould also go with Guardians of Charon, Companions of Charon, etc.
The other would be the "Apostles of Aegon", from the ancient Terran epic or perhaps historical tale of a brave group of four (or five) ancient psykana Magi who fought against a plague of madness and warp anomalies in pre-historic Merica, even repelling an evil god and a powerful wizard. I like this one because by calling themselves the followers of of an ancient Magi, they more remember their bonds with the Mechanicus (and totally not because of personal bias)