No. It doesn't even have to be something alive:
https://lh3.googleusercontent.com/pr...PDiQZAvKJC5FD1

The seemingly-likely notion that VV might be rendered as fang marks makes me wonder if the Rider franchise will revisit the vampire concept. If so, I'm sure it'd take a different spin on it than Kiva. Maybe a vampire-hunter Rider...?

Ah, well, it's all speculation for now. I'll just be glad to be done with Gotchard.

This would work well for more naturalistic action as an homage to Amazon. Although, in the concept of a vampire hunter, the question naturally arises: "Why limit yourself to only vampires?" Especially considering that these will most likely not be vampires so much as kaijins cosplaying as them.

The v-fangs definitely make it sound like Kiva II, but from what I've heard about predator and prey monsters, it might be more like every Rider in this one is Beast-coded.

:rolleyes

There is literally no "V" sound in Japanese. Hence pronunciations like "Baiolet" for Violet, "Bui" for V, etc...

That katakana is used to transliterate "V"/"Vu" words from other languages, yes, but functionally it's still pronounced "Bu."

Sure, I know it's only a minor difference. But "vu" and its family are used to emphasize the v sound instead, otherwise they would've just used "bu" like they did for Drive (Doraibu). As a recent example, Valvarad is read with "Va" followed by "ba", so the intention is to emphasize the first kana.

Yes, you're correct when we consider solely the standard rule set, but there is a little workaround method within the Japanese language to emulate the V sound for some cases by adding the dakuten mark (the double quotation-looking mark used to express sounds such as が, ば, ざ, and だ (ga-, ba-, za-, and da-) to か, は, さ, and た (ka-, ha-, sa-, and ta-) respectively) on the letter ウ (romanized as u but pronounced ooh). This results in the letter ヴ which is used to express sounds such as ヴァ, ヴィ, ヴェ, and ヴォ (pronounced va-, vi-, ve-, and vo- respectively). This has been a relatively recent addition, since 1954 according to what I googled, as more non-Japanese words have been integrated into the vocab pool so to speak.

Yes, I know this. The fact remains that the average Japanese speaker cannon form the sound of a "v," in the same way the average English speaker can't pronounce ㇻ, リ, ル, etc.

Gavv is not a word in any language that I can find, so it's not a transliteration or even a pun on a foreign word that sounds similar. It's a stylistic twist on the word/onomatopoeia "gabu," which refers to chewing, for a Kamen Rider based on snack foods. The meaning in is clear.

Well we still don't know if its snack foods persay but at least we can say the name means bite at least so the first rider theme we know is biting

The rider could have a day job as a food journalist.
Gavv could have the Gift of Gab ;-)