The alias came to its peak in the series finale when Phoebe successfully got Rachel (and eventually the rest of the passengers) off a plane to Paris by telling her over the phone she suspected one of the “phalanges” might be faulty.
Every once in a while, the characters of Friends would use pseudonyms for whatever reason, with Joey going by Ken Adams at one time and Phoebe, more than once, introducing herself as Regina Phalange.
While the last name may be synonymous with a bone that exists in the finger or the toe, it certainly rolls off the tongue more effectively than “Princess Consuela Banana Hammock.”