Lou
Meaning
traditionally famous warrior (diminutive of Louise)
The story
Lou is Louis at its most companionable, one syllable clipped from an old Germanic name meaning renowned warrior, worn by French kings and American regular guys alike. It entered the earliest American records already strong, spent much of the twentieth century slowly thinning, and lately has shown a small tick of new life as short vintage names come back into style. Its defining bearer is Lou Gehrig, the Yankees first baseman they called the Iron Horse, who played 2,130 consecutive games before the disease that now informally carries his name forced him from the field. Standing at home plate in 1939, dying and knowing it, he called himself the luckiest man on the face of the earth. Some names are made famous by triumph. Lou was made famous by grace, which turns out to wear even better.
The formal names behind Lou
Lou is an established short form of each of these names.
Louise · French origin · famous in battle, traditionally
Louisa · Germanic origin · feminine form of Louis, 'famous warrior'
Eloise · French origin · variant of Heloise; etymology disputed, traditionally "healthy, wide"
Louis · Germanic origin · famous in battle, traditionally
Lou around the world
One shared root links 9 names across 5 languages.
Shared root: from Frankish Hludwig, hlud "famous" + wig "war", smoothed through Latin Ludovicus and French Louis
The constellation
More branches
Popularity, 1890–2024
Shape drawn from US Social Security baby-name records. Lou peaked in the 1890s and the 1950s in nearly equal measure.
See popularity in Brazil
Popularity in Brazil
61 people · the #58,130 first name in Brazil · median age 34
Source: IBGE, Censo Demográfico 2022
When you meet Lou
Most people given the name Lou in the United States were born between 1950 and 1969. The Lou you meet today is most often in her 60s or 70s.
Estimated from US Social Security birth registrations and typical lifespans; a rough guide, not a rule.
The Lou deep dive
Whether you’re naming a baby or exploring your own name’s history, this is a personal letter, not a list: where Lou truly comes from, how it traveled, and what a century of records reveals. If you have grown a tree on nametree, it also considers how Lou fits with your family’s names and surname.
Keep exploring
Does Lou fit YOUR family?
nametree reads your family’s names and finds the ones that belong. Free, private, no ads.
Add Lou to your family’s tree →