Sibling names for Declan
Names that sound like they belong in the same family as Declan usually share its era. These sister and brother names rose and fell on a similar curve to Declan, whose busiest decade was the 2010s, and are about as common, so neither child's name will feel dated or unusual next to the other.
Sister names for Declan
| Name | Meaning | Rank 2025 | Babies, last 5 years | Peak decade |
|---|---|---|---|---|
| Charlee | variant of Charlie (Charles) | #417 | 4,475 | 2010s |
| Raelynn | #116 | 12,572 | 2010s | |
| Quinn | descendant of Conn (surname) | #97 | 14,494 | 2010s |
| Liv | protection (Norse); associated with 'life' | #896 | 1,835 | 2010s |
| Brynlee | #243 | 6,840 | 2010s | |
| Hadley | heather clearing (place name) | #121 | 11,971 | 2010s |
| Jemma | gem (variant of Gemma) | #866 | 1,994 | 2010s |
| Scarlett | scarlet (surname for a cloth dealer) | #32 | 31,763 | 2010s |
| Journee | journey (word name) | #258 | 7,102 | 2020s |
| Kensley | #742 | 2,148 | 2010s | |
| Adeline | noble | #59 | 16,287 | 2010s |
| Arabella | #213 | 7,062 | 2010s |
Brother names for Declan
| Name | Meaning | Rank 2025 | Babies, last 5 years | Peak decade |
|---|---|---|---|---|
| Grayson | son of the steward (surname) | #51 | 33,259 | 2010s |
| Jayce | pet form of Jason | #167 | 11,412 | 2010s |
| Ryker | #183 | 10,667 | 2010s | |
| Easton | east farmstead (place name) | #110 | 18,980 | 2010s |
| Zayden | #214 | 9,223 | 2010s | |
| Finn | #206 | 9,658 | 2010s | |
| Carson | #124 | 16,179 | 2010s | |
| Maximiliano | from Maximilian (Latin 'greatest') | #280 | 5,917 | 2010s |
| Nikolai | victory of the people (Russian Nicholas) | #605 | 2,536 | 2010s |
| Jax | short form of Jackson | #342 | 5,944 | 2010s |
| Liam | Irish short form of William | #1 | 104,977 | 2010s |
| Sawyer | one who saws wood (surname) | #122 | 14,725 | 2010s |
Declan's era
Declan ranked #139 for boys in 2025, against #112 in 2015. Its best year was 2019, at #95. 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, Declan 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 Declan's since 1880, and its recent number of babies is within about twelve times Declan's, so the names are in the same league. Names starting with the same letter as Declan or with the same ending are left out, so the names go together without matching. Spellings of Declan itself are excluded.