Sibling names for Lou
Names that sound like they belong in the same family as Lou usually share its era. These sister and brother names rose and fell on a similar curve to Lou, whose busiest decade was the 1950s, and are about as common, so neither child's name will feel dated or unusual next to the other.
Sister names for Lou
Brother names for Lou
Lou's era
Lou ranked #1,929 for boys in 2025, against #3,060 in 2015. Its best year was 1881, at #452. Names that rose and fell with it share its period feel, which keeps the set consistent.
Timeless names that go with any sibling
These names have been used steadily for a hundred years, so they sit comfortably next to a name from any era, Lou included.
Girls: Elizabeth, Maria, Cecilia, Julia, Miriam, Nina. Boys: Samuel, Anthony, Wesley, Vincent, Calvin, Victor.
Same era, but close to Lou
These names follow Lou's curve too, but we left them out above because they share a first letter or an ending with Lou. Some parents like that echo; if you do, start here.
How these were chosen
Each suggestion's share of US babies has followed a curve close to Lou's since 1880, and its recent number of babies is within about twelve times Lou's, so the names are in the same league. Names starting with the same letter as Lou or with the same ending are left out, so the names go together without matching. Spellings of Lou itself are excluded.