| Casey | Leannan | |
|---|---|---|
| Meaning | Vigilant in war | Lover, sweetheart |
| Origin | irish | irish |
| Gender | Unisex | Unisex |
| Pronunciation | KAY-see | LAN-awn |
| Syllables | 2 | 2 |
| Trend | Steady | — |
| Decade | Casey | Leannan |
|---|---|---|
| 2020s | 5,474 | 0 |
| 2010s | 5,582 | 0 |
| 2000s | 12,261 | 0 |
| 1990s | 29,253 | 0 |
| 1980s | 35,968 | 0 |
| 1970s | 18,987 | 0 |
| 1960s | 4,723 | 0 |
| 1950s | 2,656 | 0 |
| 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 and Scottish Gaelic leannan (leannán) 'lover, sweetheart, darling', a diminutive of leann 'affection, love'. Familiar from the folklore figure leannan sidhe, the fairy lover.
Casey means Vigilant in war (irish origin), while Leannan means Lover, sweetheart (irish origin).