Sunday name is a term used to describe a person's formal name that they may use on official documents, such as their birth certificate, bank account or passport. There are many different synonyms for this term, including given name, first name, Christian name, baptismal name, legal name or formal name. These names often differ from a person's nickname or what they are commonly referred to as in everyday situations. Some people may choose to go by their Sunday name in professional or formal settings, while others prefer to use a different name altogether. Regardless, a person's Sunday name holds significant importance and can often offer insight into their cultural or familial background.