I'm not saying DHH is more widely known than Fabrice Bellard. I'm saying that it really depends on your audience. I can think of many colleagues over the years who would know who David is, but not Fabrice.

(Also, I specifically chose DHH as somebody who's highly unlikely to show up in the same discussion as Fabrice Bellard, not because I'm a fan of his. Judging from the replies, I succeeded beyond my wildest expectations!)