What does Deian mean?
Deian is a Welsh form of David, “beloved.”
What does Gwilym mean?
Gwilym is the Welsh form of William, “resolute protector.”
Deian vs Gwilym
Which is more popular?
Deian and Gwilym are given to a similar number of US babies today.
| Deian | Gwilym | |
|---|---|---|
| Meaning | Beloved | Resolute protector |
| Origin | Welsh | Welsh |
| Gender | Boy | Boy |
| Pronunciation | DAY-an | GWIL-im |
| Syllables | 2 | 2 |
| First appeared | 2017 | 2005 |
| Peak year | 2023 (13) | 2005 (5) |
| In 2025 | 0 | 0 |
| Trend | Steady | Steady |
Popularity over time, 1880–2025
Deian
Gwilym
Source: US Social Security Administration.
Births by decade
| Decade | Deian | Gwilym |
|---|---|---|
| 2020s | 41 | 0 |
| 2010s | 10 | 0 |
| 2000s | 0 | 5 |
Frequently asked questions
Is Deian or Gwilym more popular?
Deian and Gwilym are given to a similar number of US babies today.
What is the difference between Deian and Gwilym?
Deian means Beloved (Welsh origin), while Gwilym means Resolute protector (Welsh origin).
Which name is older, Deian or Gwilym?
In US records, Deian first appears in 2017 and Gwilym in 2005, so Gwilym has the longer recorded history.