Here are some possibilities:
* "Zirl" could be a nickname or a shortened version of another Yiddish name. Perhaps you're thinking of "Zisel" (meaning "little Zis"), "Zissel" (meaning "small Zis"), or "Zirl" (meaning "sweet little one").
* "Zirl" might be a surname, not a given name. In this case, it could have originated from a place name or a descriptive word.
To help me understand what you're looking for, could you provide more context? For example:
* Where did you hear this name?
* What are the circumstances surrounding the name? (e.g., family history, a character in a story)
With more information, I can help you find the correct meaning of the name.