Monday is an English first name derived from the name of the day of the week. The word comes from Old English mōnandæg, meaning “moon’s day,” a translation of the Latin diēs Lūnae. The name can be given to children born on a Monday, a practice especially common in parts of Nigeria, where day names are widely used.In the Roman calendar, each day was dedicated to a celestial body. Monday was named after the Moon, which in Latin is Lūna. The Germanic languages calqued this naming pattern: Old High German mānetag gives modern German Montag, and Old Norse mánadagr yields Scandinavian forms such as Swedish måndag. The English word was recorded before 1200 as monedæi and evolved into its modern form.As a given name, Monday is relatively rare in English-speaking countries outside Nigeria. It is considered unisex, but usage data is sparse. In Nigeria, day-naming traditions (e.g., Monday, Friday) are common among certain ethnic groups, such as the Akan and Yoruba, though Monday specifically is also used by Igbo people. The choice of a day name can reflect the circumstances of birth or family beliefs.