The independents and microbrands are usually individual designers, or small team with a Name lead. Just that "rock star" and "watch design" might be a bit mutually exclusive right now. As gen pop, and you'd probably get more people asking about who designed the Apple Watch, "because them!" than any watch designer, ever.
I do find it funny that there are a few Genta designed watches, which go for considerably more than an actual Genta brand watch. Speaking of which, there are some fun and reasonable deals to be had. Genta designed the Omega Polaris line, the one with the inlaid cases? Quartz and small, no longer darlings of the watch collecting world, they are a relative Big Name bargain. Like those Seiko models from the OP.