Wikipedia claims that Jean-Luc Picard was named after the Piccard twins:
Star Trek creator Gene Roddenberry named Picard for one or both of the twin brothers Auguste Piccard and Jean Felix Piccard, 20th-century Swiss scientists.
However, neither of the two references given in the Wikipedia entry for this "fact" are authoritative. (They are informal claims made by individuals with no obvious connection to Star Trek.) The same references are repeated in the entry on Auguste Piccard.
Was Captain Picard really named after one or both of the Piccard twins?