| Sloane | Casey | |
|---|---|---|
| Meaning | Raider / warrior | Vigilant in war |
| Origin | irish | irish |
| Gender | Unisex | Unisex |
| Pronunciation | SLOHN | KAY-see |
| Syllables | 1 | 2 |
| First appeared | 1958 | 1888 |
| Peak year | 2025 (2,077) | 1990 (4,134) |
| In 2025 | 2,077 | 1,072 |
| Trend | Near its peak | Steady |
Source: US Social Security Administration.
| Decade | Sloane | Casey |
|---|---|---|
| 2020s | 11,475 | 5,474 |
| 2010s | 10,125 | 5,582 |
| 2000s | 1,605 | 12,261 |
| 1990s | 785 | 29,253 |
| 1980s | 305 | 35,968 |
| 1970s | 193 | 18,987 |
| 1960s | 175 | 4,723 |
| 1950s | 7 | 2,656 |
| 1940s | 0 | 571 |
| 1930s | 0 | 277 |
| 1920s | 0 | 347 |
| 1910s | 0 | 444 |
| 1900s | 0 | 89 |
| 1890s | 0 | 37 |
| 1880s | 0 | 6 |
From the Irish surname Ó Sluaghadháin, built on 'sluagh' (host, army, raiding party). Authoritative sources gloss the root name as 'raid/raider'; 'warrior/man of arms' is a common popular reading of the 'army' sense.
From the Irish surname Ó Cathasaigh, whose byname 'cathasach' derives from 'cath' (battle) and is usually glossed 'vigilant, watchful' (in war); a secondary reading is 'noisy'.
Sloane is more popular than Casey today: about 2,077 US babies were given the name Sloane in 2025, compared with 1,072 named Casey.
Sloane means Raider / warrior (irish origin), while Casey means Vigilant in war (irish origin).
In US records, Sloane first appears in 1958 and Casey in 1888, so Casey has the longer recorded history.