Sibling names for Sunday
Names that sound like they belong in the same family as Sunday usually share its era. These sister and brother names rose and fell on a similar curve to Sunday, whose busiest decade was the 2020s, and are about as common, so neither child's name will feel dated or unusual next to the other.
Sister names for Sunday
Brother names for Sunday
Sunday's era
Sunday ranked #947 for girls in 2025, against #5,279 in 2015. Its best year was 2025, at #947. 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, Sunday included.
Girls: Elizabeth, Maria, Lydia, Cecilia, Julia, Miriam. Boys: Anthony, Wesley, Vincent, Calvin, Victor, Oscar.
Same era, but close to Sunday
These names follow Sunday's curve too, but we left them out above because they share a first letter or an ending with Sunday. 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 Sunday's since 1880, and its recent number of babies is within about twelve times Sunday's, so the names are in the same league. Names starting with the same letter as Sunday or with the same ending are left out, so the names go together without matching. Spellings of Sunday itself are excluded.