However, if you're looking for Polish names with a similar feel or meaning, you could consider:
* Brygida: This name is a Polish form of Bridget, which shares a similar sound with Brianna.
* Brylan: This name, while uncommon, has a similar sound and feel to Brianna.
* Bolesława: This name, meaning "glorious in battle," has a strong and powerful feel, similar to Brianna.
Ultimately, the best Polish name for Brianna will depend on your preferences and the specific qualities you're looking to capture.