When I visited a Convent which was Cloistered Carmelites, they had all taken a new name. When I entered a Franciscan Convent which was active, not cloistered, only the Sisters who had made their professions prior to 1960 had changed their names at the time they took their Final Vows. All of the younger Sisters were still known by both their first & last names they had prior to entering the Convent. I didn’t care for that, personally. My first name is “Judith”, and there is no “St. Judith”, although my middle name “Louise” is a Saint’s name. However, we were (required) bi-lingual, and the other Novices “gave” me the name “Maria Louisa”, because I was so devoted to Our Blessed Mother, and Louisa was Louise (in Spanish). However, had I taken Final Vows, I would have been known as “Sister Judith” officially, and that is the name that would have been on the papers signed at the time of Final Vows. I’ve had only one Diocesan Priest here who insisted on his last name being used. All the others were known as “Fr. Bob”, “Fr. Kevin”, etc… which I find more personal and friendlier. We all like that here!