However, there are a few options for Irish names that sound similar or have similar meanings:
* Juliana: This name is the Latin feminine form of "Julius," meaning "youthful" or "downy-bearded."
* Gillian: This name is a variation of "Julian" and is sometimes used as an Irish equivalent of "Jillian."
* Saoirse: This Irish name means "freedom" and is a popular choice for parents looking for a strong and beautiful Irish name.
Ultimately, choosing the "best" Irish equivalent for "Jillian" depends on the meaning and sound you prefer.