I believe Clancy has one on the basis that "Tom Clancy's" is more a franchise than an author (he hasn't written them all himself for a long time) much like, say, the James Bond franchise. In addition there's a loose continuity between some entries (Ghost Recon, Rainbow Six and HAWX are IIRC all set in the same world). I don't think that would immediately apply to other authors in the same way.
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