Gabay or Gabai: origin of surname

Has anyone been able to find from which side of the family did Ana Francisca and Maria Gabay got their surname? I have tried to find that surname among Spanish surnames with little success. However, I have found that Gabay or Gabai is a Jewish surname. Further I learned that Gabay is a person that performs duties similar to an usher. Here is a description:

"In Judaism, a person who helps to organize the running of a synagogue service; one or more gabai may be involved. Duties include welcoming visitors, ensuring that everyone has a siddur (prayer book), organizing the seating arrangements, and choosing the congregants who will open the ark or read from the Torah. The gabai will also ensure that the wine is present for the kiddush, a prayer recited over wine before it is shared by the congregation."

Any ideas?

Jaime