Alias first name???

Does anyone know if children were born under alias names back in 1933 in Ok City Ok ??? Have OBC and i have not located a birth mother with the name on OBC..have found one that suits the middle and surname, so i wonder if the birth mother could have used alias first name at hospital. It was Catholic Charities agentcy that was involed and the birth mother stayed at one of their maternity homes..have read they were assigned alias names. If anyone has any info please let me know.