There was nothing like this in IA10.
Visually, they were presented as a standard Codex Chapter with more Mark IV/VI armour than usual.
The Marines named in their Index Astartes look to be derived from a mix of mock Latin (e.g. "Audamus"), Mongolian ("Sartaq"), vaguely Arabic ("Saraken", "Damaskan", slain in the defence of the "Ful'Souk Settlement"), and a few oddities like "Surabaya" (an Indonesian city derived from Sanskrit).
Nothing at all that strikes me as derived from Japanese language or culture, and camouflage and ambush tactics don't really say "samurai" to me.
If anything, the names, quotations about "the winds of the desert" and the focus on prophecy gives me a vaguely Middle Eastern vibe, with traces of their White Scars roots.
Edited by Lucien Eilam, 21 March 2021 - 03:48 PM.