Wikipedia doesn't think so, citing the US copyright office
https://commons.wikimedia.org/wiki/Commons:When_to_use_the_P...
This is true, it'd be a trademark issue if anything, not a copyright one. From this page:
> it may be reproduced, as long as the reproduction cannot be mistaken for an authentic signature.
Visual artists have a right of attribution via the Visual Artists Rights Act (17 U.S.C. § 106A). This includes protection against misattribution.