More info about the name "Marilou"
Most likely a combination of Mary and Louise. Mary is an English form of Maria, the name used in the New Testament, ultimately derived from the Hebrew name Miryam. There are several possible meanings of Miryam, some of them being: "lots of bitterness", "wished for child", "bitter", "rebellious". Mary is the name of different characters in New Testament, the most important ones being the Virgin Mary, mother of Jesus, and Mary Magdalene. The name has been extremely popular for centuries, especially among Christians. Louise is of French or Germanic origin, a feminine form of Louis and Ludwig, which means "famous warrior". In English speaking countries, Louise has been used since the 19th century. It is also the name of a famous opera, Louise, composed by Gustave Charpentier.