In Europe we did call the music of that time "Beat Music", in germany we had many pop music tv shows that were Beat this and Beat that (using the English word)

I met Rod Davis in 2016, I should have asked him, but I always assumed they were named after their style of music.

And the spelling of Led Zeppelin was intentionally a phonetic disambiguation, lest the band be misunderstood to be superlative on airships.