Here's a 2022 from Quartz article that might have some context on this. Anduril isn't on the list according to the footnote, but Thiel and Lucky have since had a history collaborating on projects with the same naming scheme.

[1] https://qz.com/1346926/the-hidden-logic-of-peter-thiels-lord...

[2] https://fortune.com/2025/07/07/peter-thiel-palmer-luckey-ere...