Is the name Ceyda and the surname Ceyd found only in Turkey?

I think you mean the given name "Ceyda" and the surname "Ceyd" (or similar). Short answer: both are primarily Turkish/used in Turkish-speaking communities, but variations appear elsewhere.

Details:

• Ceyda is a feminine given name of Turkish origin, common in Turkey and among Turkish diaspora communities (Germany, Netherlands, Austria, etc.). It comes from Arabic roots (related to names like Jayda/Jayda), so similar-sounding names also exist in Arabic-speaking countries and among Muslims.
• The surname Ceyd is much less common; Turkish surnames vary and some may be rare or regionally concentrated. Surnames similar in spelling can appear in other countries (through migration or independent origins), but "Ceyd" as a family name is mainly found within Turkey or families of Turkish origin.
• If you see the same name outside Turkey, it can be because of:
  • Turkish diaspora and migration
  • Arabic/Islamic name variants with different spellings (e.g., Jayda, Jaida)
  • Coincidental similarity from unrelated languages

If you want, tell me how you saw the name (country or spelling) and I can check likely origin and frequency.