Sibling names for Kathleen
Names that sound like they belong in the same family as Kathleen usually share its era. These sister and brother names rose and fell on a similar curve to Kathleen, 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 Kathleen
| Name | Meaning | Rank 2025 | Babies, last 5 years | Peak decade |
|---|---|---|---|---|
| Connie | pet form of Constance | #3,075 | 245 | 1950s |
| Diane | #2,620 | 400 | 1950s | |
| Marcia | feminine of Marcius (from Mars) | #3,434 | 188 | 1950s |
| Susan | lily (from Susanna) | #1,091 | 1,099 | 1950s |
| Sharon | the Sharon plain | #1,256 | 934 | 1950s |
| Donna | lady | #1,965 | 506 | 1950s |
| Sandra | short form of Alexandra | #1,210 | 1,155 | 1940s |
| Brenda | #1,527 | 915 | 1950s | |
| Linda | gentle, tender (Germanic) | #902 | 1,622 | 1950s |
Brother names for Kathleen
| Name | Meaning | Rank 2025 | Babies, last 5 years | Peak decade |
|---|---|---|---|---|
| Bruce | #536 | 2,735 | 1950s | |
| Dennis | follower of Dionysus (Greek) | #707 | 1,992 | 1950s |
| Gary | spear (from names in Gar-/Ger-) | #1,073 | 1,081 | 1950s |
| Ronnie | pet form of Ronald or Veronica | #1,067 | 1,057 | 1950s |
| Danny | pet form of Daniel, 'God is my judge' | #628 | 2,331 | 1950s |
| Terry | from Thierry (Theodoric); or short for Terence, Theresa | #1,116 | 1,015 | 1950s |
| Roger | famous spear (Germanic) | #834 | 1,712 | 1950s |
| Johnny | pet form of John ('God is gracious') | #458 | 3,605 | 1950s |
| Douglas | black stream | #807 | 1,595 | 1950s |
| Alan | #191 | 10,204 | 1950s | |
| Wayne | wagon maker (English surname) | #655 | 1,824 | 1950s |
| Dale | valley | #1,410 | 653 | 1950s |
Kathleen's era
Kathleen ranked #1,156 for girls in 2025, against #824 in 2015. Its best year was 1949, at #9. 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, Kathleen included.
Girls: Elizabeth, Maria, Lydia, Cecilia, Julia, Miriam. Boys: Samuel, Anthony, Wesley, Vincent, Calvin, Victor.
Same era, but close to Kathleen
These names follow Kathleen's curve too, but we left them out above because they share a first letter or an ending with Kathleen. 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 Kathleen's since 1880, and its recent number of babies is within about twelve times Kathleen's, so the names are in the same league. Names starting with the same letter as Kathleen or with the same ending are left out, so the names go together without matching. Spellings of Kathleen itself are excluded.