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