[Red Sea Swimmer]

"Percival Frequency" sounds like some sort of mathematical thing. I'll have to check with my girlfriend on that. (She's a Maths wizz.) Or it could be a character's name from one of those bawdy British "Carry On" films from the 1970's.

[perfect stranger]

That was a name I used when I played in a band called "Das Funk Haus" in the late '90's.