| Casey | Sloane | |
|---|---|---|
| Meaning | Vigilant in war | Raider / warrior |
| Origin | irish | irish |
| Gender | Unisex | Unisex |
| Pronunciation | KAY-see | SLOHN |
| Syllables | 2 | 1 |
| First appeared | 1888 | 1958 |
| Peak year | 1990 (4,134) | 2025 (2,077) |
| In 2025 | 1,072 | 2,077 |
| Trend | Steady | Near its peak |
Source: US Social Security Administration.
| Decade | Casey | Sloane |
|---|---|---|
| 2020s | 5,474 | 11,475 |
| 2010s | 5,582 | 10,125 |
| 2000s | 12,261 | 1,605 |
| 1990s | 29,253 | 785 |
| 1980s | 35,968 | 305 |
| 1970s | 18,987 | 193 |
| 1960s | 4,723 | 175 |
| 1950s | 2,656 | 7 |
| 1940s | 571 | 0 |
| 1930s | 277 | 0 |
| 1920s | 347 | 0 |
| 1910s | 444 | 0 |
| 1900s | 89 | 0 |
| 1890s | 37 | 0 |
| 1880s | 6 | 0 |
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'.
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.
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.
Casey means Vigilant in war (irish origin), while Sloane means Raider / warrior (irish origin).
In US records, Casey first appears in 1888 and Sloane in 1958, so Casey has the longer recorded history.