Grappelli is the name of a renowned jazz violinist, Stephane Grappelli. Although there are no direct synonyms for this name, there are a few similar terms that can be used to describe his musical style. One term that comes close is "gypsy jazz," which refers to the genre of music pioneered by Grappelli and the guitarist Django Reinhardt in the 1930s. Another term that can be used is "swing violin," which describes the way Grappelli would improvise with rhythmic and melodic variations. Finally, "improvisational jazz violinist" is also a good way to describe Grappelli's musical style, which involved notable improvisation and the integration of multiple styles of music.