Common variations:
* Carole
* Carolin
* Carolyne
* Caroline (the most common variation)
Less common variations:
* Carolayne
* Carryln
* Karolyn
* Karoliyn
* Karoline
Alternative spellings with different origins:
* Carola (German)
* Carolyna (Latin)
* Carolaine (French)
It's worth noting that the spelling "Caroline" is considered the most traditional and widely accepted variation.