I imagine when you’re dealing with so many weapons systems it’s helpful to have memorable names. Beats the heck out of X1, X2, X3, X4, X5, X6 (not to pick on BMW, but to pick on BMW).
(Update: not to mention the need to appeal to Congress to keep funding these systems.)
Yep, it’s mainly for catchy names for funding.
If you want to pick on a company for strange naming, Sony is a great choice. WH-1000XM3, WF-1000XM3, Xperia 1 III, etc.