Sibling names for Kay
Names that sound like they belong in the same family as Kay usually share its era. These sister and brother names rose and fell on a similar curve to Kay, whose busiest decade was the 1940s, and are about as common, so neither child's name will feel dated or unusual next to the other.
Sister names for Kay
| Name | Meaning | Rank 2025 | Babies, last 5 years | Peak decade |
|---|---|---|---|---|
| Carol | short form of Caroline; also male Carolus | #2,242 | 391 | 1940s |
| Marian | from Marion (Mary), or Mary + Ann | #1,103 | 1,023 | 1920s |
| Janice | variant of Jane | #2,522 | 428 | 1950s |
| Claudette | #10,266 | 42 | 1940s | |
| Nancy | pet form of Ann (or Agnes) | #967 | 1,382 | 1950s |
| Glenda | holy + good (Welsh coinage) | #5,987 | 112 | 1950s |
| Janet | pet form of Jane | #2,791 | 428 | 1950s |
| Judith | woman of Judea, Jewish woman | #790 | 1,562 | 1940s |
| Joanne | from Joanna, or Jo + Anne | #2,630 | 355 | 1950s |
| Joyce | lord (Breton, via Josse) | #1,074 | 1,247 | 1940s |
| Sue | short form of Susan, 'lily' | #9,387 | 43 | 1940s |
Brother names for Kay
| Name | Meaning | Rank 2025 | Babies, last 5 years | Peak decade |
|---|---|---|---|---|
| Jerry | pet form of Gerald, Gerard, Jeremy and others | #907 | 1,523 | 1940s |
| Ronald | ruler with counsel (Norse, via Scottish Gaelic) | #638 | 2,429 | 1940s |
| Roger | famous spear (Germanic) | #834 | 1,712 | 1950s |
| Jerald | variant of Gerald; "spear rule" | #4,081 | 130 | 1940s |
| Jimmy | pet form of James | #847 | 1,536 | 1940s |
| Wayne | wagon maker (English surname) | #655 | 1,824 | 1950s |
| Freddie | pet form of Frederick | #1,510 | 414 | 1940s |
| Benny | pet form of Benjamin | #841 | 1,197 | 1940s |
| Darrell | from d'Airel (Norman place name) | #1,691 | 588 | 1960s |
| Don | short form of Donald, 'world ruler' | #1,795 | 492 | 1940s |
| Bobby | pet form of Robert | #1,097 | 986 | 1930s |
Kay's era
Kay ranked #3,946 for girls in 2025, against #3,632 in 2015. Its best year was 1941, at #70. 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, Kay included.
Girls: Elizabeth, Maria, Lydia, Cecilia, Julia, Miriam. Boys: Samuel, Anthony, Wesley, Vincent, Calvin, Victor.
How these were chosen
Each suggestion's share of US babies has followed a curve close to Kay's since 1880, and its recent number of babies is within about twelve times Kay's, so the names are in the same league. Names starting with the same letter as Kay or with the same ending are left out, so the names go together without matching. Spellings of Kay itself are excluded.