I could shed all the light ..... but I'll refrain from posting any other names publicly for now.
The UK registrations quoted in the initial post are indeed based on names of individual employees. Of the list, only one has any significance in terms of marking an occasion, the others were just who happened to be in the office the day the form was filled out or what combination of letters were still available from the CAA
Others have done it ....... the story about someone's daughter's initials are true, although it was for Dutch aircraft.
Someone at Bristow is equally clever, because there's a load of folk still not twigged the significance of G-XCII or G-ZZSA