The name Malou is a girl's name meaning "bitter; renowned warrior". Malou and is often added to lists like Best One-of-a-Kind Names for Girls and discussed in our forums with posts like "List 5 middles".
From the experts:
This charming name, popular in France and the Netherlands, has not traveled to the U.S. yet but would make a modern way to honor grandma Mary or Louise, or as a perfect short form of Mary Louise. Or, with the growing fashion for nickname names, it can stand perfect well on its own. One of several similar variations — Lou, Lilou, Louane — in vogue in Europe.