Previously, there must have been a paper with first names for the child and signed by both parents when they arrived at the maternity hospital, but the name was definitely communicated to the registrar who visited her mother in the maternity hospital. I experienced a case where the registrar was on vacation and the children were nameless for almost a week. There was a lady who had just given birth to her eighth boy, and she was obviously coming up with a name with a registrar. But it doesn't have to be the same everywhere ...