To give you a more "profesional" explanation of gabay I googled it and it means:
"A gabay works in the synagogue; I guess you'd say he's the manager (but not the rabbi)."
http://wiki.answers.com/Q/What_is_the_meaning_of_the_Hebrew_...'

Jewish (Sephardic and eastern Ashkenazic): status name from Hebrew gabay ‘warden’, denoting a trustee or warden of a Jewish public institution, especially a synagogue, or a manager of the affairs of a Hasidic rabbi.
http://genealogy.familyeducation.com/surname-origin/gabay