Calliste (or Kalliste) derives from ancient Greek kallistē (καλλίστη) — the feminine superlative of kalos (beautiful), meaning "most beautiful."
While French uses Calliste as a rare given name (and Calliste appears in some francophone contexts), it's etymologically Greek, not French. The French form would typically be Calliste (same spelling) but pronounced /kalist/.
No significant presence. Grenada's naming patterns reflect English, French Creole, and African influences (e.g., Keisha, Shennel, Kenroy, Merle). "Calliste" does not appear in Grenadian civil records or cultural usage.
If you encountered "Calliste" in a Grenadian context, it's likely an individual family choice or error—not a cultural pattern.