My mother's maiden name is Gembala, and she comes from Tarnov. I don't know how common that surname is, but she is one of 7 surviving childen of John and Ewa Gembala. John was my grandfather, and I believe his parent's names were Alojzy & Maria. I don't know his brothers or sisters names, but attached a picture of him as a child. He's the center figure.
John and his family settled in New Bedford, MA.
If interested, feel free to email me back.