Hi Nick,
No idea how these ones came about.
The European waypoints are allocated according to availability within the ICAO system, although where it is possible some relevance will be attempted.
Looking through what is left in the European allocation, there ain't too much to choose from from now on
Certainly no PROON, PRUNE, or DANNY.
https://www.eurocontrol.be/icard/
------------------
10 West
UK ATC'er
[email protected]