This name derives from the Latin "septem > septĭmus > Septĭmĭus", the seventh son of the family or the seventh or youngest of seven members of the same family, someone born in September. September (from Latin septem, "seven") was originally the seventh of ten months on the oldest known Julian calendar until 46 BC. September marks the beginning of the ecclesiastical year in the Eastern Orthodox Church. Septimus is a Latin praenomen, or personal name. It was never particularly common at Rome, but it gave rise to the patronymic gens Septimia. The feminine form is Septima. The name was not regularly abbreviated.