Rockets also aren’t planets, and yet: Saturn V
Rockets also aren’t mythological horse/man creatures, and yet: Vulcan Centaur
You’re overthinking it.
Rockets also aren’t planets, and yet: Saturn V
Rockets also aren’t mythological horse/man creatures, and yet: Vulcan Centaur
You’re overthinking it.
Falcon 9 has nine first stage engines, Falcon 1 had a single engine. It's not a version number.
Edit: I had to look it up because Saturn 1 is not a single engine vehicle. It turns out that the Saturn V is design C-5 of the Saturn family of rockets, with A, B and C1-4 designs preceding it (not all designs where built), so the "V" in Saturn V is basically a version number, despite the Saturn V first stage having 5 engines
"Falcon" was almost certainly chosen so the BFR could be pronounced "Big Fucking Rocket", perhaps also influenced by the BFG in Doom/Quake.
Also note how "SpaceX" is pronounced.