Unique means one of a kind. As my eighth-grade teacher taught, it's one of those words that doesn't lend itself to comparison. Often we'll hear that such-and-such is the "most unique" product on the market. No, it may be the most unusual, but one thing can't be more one of a kind than another. Fingerprints, DNA samples, retinal scans, and snowflakes are unique, or so we're told. People are unique in their experiences, but in their personalities I am not so sure.
On the Internet you can find lists of "unique" baby names, but it's a good bet that if the names are on a list, they're not unique. One of the names I saw was Harper, and Harper Lee came right to mind. And Quentin immediately conjured up Tarantino.