Etymology of "Astartes"?

[MarqFJA87]

Has Rick Priestley or any of the other early developers of WH40K ever talked about how they came up with the name "Astartes"? I've seen plenty of speculation around the fan base over the years pointing to the Ancient Near Eastern goddess Astarte (who is a Northwest Semitic equivalent of the East Semitic Ishtar), blending of Latin aster/astrum with English star as (potential) sources for the name, but never found any official statement on the matter from the people who created it in the first place. And obviously, the "Amar Astarte" explanation not only postdates the introduction of "Astartes" as a name by decades, but only counts as a Watsonian (in-universe) answer, whereas I'm looking for the Doylist (out-of-universe) one.

 

If no such official statement exists, is there a way to send the question to them and get the answer? Does any of them do public AMAs from time to time, for example?