Lou is usually a short form of Louise, Louisa, or Lucy in English-speaking countries, when Lou is used for girls at all. But in France and Germany, it's a fashionable choice all on its own, sure to gain even more widespread style credibility since Heidi Klum and Seal chose it for their daughter.

At one time Lou was pervasive as a girl's middle name (Mary Lou, Betty Lou), and seems to be making something of a comeback--Louis C.K. has a Mary Lou and Keri Russell named her daughter Willa Lou.

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