What does Eirian mean?
Eirian means “bright” or “beautiful” in Welsh.
What does Gwilym mean?
Gwilym is the Welsh form of William, “resolute protector.”
Eirian vs Gwilym
Which is more popular?
Eirian is more popular than Gwilym today: about 7 US babies were given the name Eirian in 2025, compared with 0 named Gwilym.
| Eirian | Gwilym | |
|---|---|---|
| Meaning | Bright, beautiful | Resolute protector |
| Origin | Welsh | Welsh |
| Gender | Boy | Boy |
| Pronunciation | AY-ree-an | GWIL-im |
| Syllables | 3 | 2 |
| First appeared | 2024 | 2005 |
| Peak year | 2024 (14) | 2005 (5) |
| In 2025 | 7 | 0 |
| Trend | Steady | Steady |
Popularity over time, 1880–2025
Eirian
Gwilym
Source: US Social Security Administration.
Births by decade
| Decade | Eirian | Gwilym |
|---|---|---|
| 2020s | 21 | 0 |
| 2000s | 0 | 5 |
Frequently asked questions
Is Eirian or Gwilym more popular?
Eirian is more popular than Gwilym today: about 7 US babies were given the name Eirian in 2025, compared with 0 named Gwilym.
What is the difference between Eirian and Gwilym?
Eirian means Bright, beautiful (Welsh origin), while Gwilym means Resolute protector (Welsh origin).
Which name is older, Eirian or Gwilym?
In US records, Eirian first appears in 2024 and Gwilym in 2005, so Gwilym has the longer recorded history.