boy's name
Cybi
KUH-bee (Welsh)
- Origin Welsh
- Gender Boy
- Syllables 2
- Letters 4
- Popularity Uncommon
- Births on record 28
Cybi is a Welsh boy's name whose meaning has not been firmly established. It honors a sixth-century saint, born in Cornwall by tradition, who founded a monastery at Holyhead, whose Welsh name, Caergybi, means "Cybi's fort." In Wales it's pronounced KUH-bee.
- Cybi is a name of Welsh origin.
- Peaked in England and Wales in 2023, when 9 babies were given the name.
- It is a recent arrival in the birth records in England and Wales.
- Today about 1 in 105,396 babies in England and Wales is given this name.
- First appears in birth records in 2019.
- 2 syllables, with the stress on syllable 1.
Cybi Over Time
Births per decade in England and Wales, 2010s to 2020s. The striped bar is the 2020s, which so far covers 2020 to 2025.
Show the numbers
| Decade | Births |
|---|---|
| 2010s | 3 |
| 2020s (to 2025) | 25 |
What Cybi Means
Cybi has no firmly established meaning, and the glosses in print do not agree. For most Welsh families the name's real weight comes from the saint and his place in Anglesey.
Where Cybi Comes From
The name's origin is unclear, and it cannot be tied to a recorded Welsh word. Saint Cybi lived in the sixth century and is associated with Cornwall and Wales, and his Cornish name is Cuby. He settled within a Roman fort at the tip of Holy Island, off Anglesey, and the town that grew there kept his name. Welsh mutates the first consonant in compounds, which is why Cybi becomes Gybi in Caergybi. English speakers know the town as Holyhead, and Welsh also calls the island Ynys Gybi, Cybi's island.
Cybi in Use
The Welsh singer Ian "H" Watkins chose Cybi for one of his twins in 2016, with Macsen for the other. Spelling can mislead English readers, since Welsh y here sounds like the u in cup.
How Popular Is Cybi?
In 2025, Cybi was given to 5 babies in England and Wales. It is used consistently but remains uncommon.
Figures for England and Wales leave out any name given to fewer than three babies in a year, so a gap means the name fell below that floor rather than went unused. Data & sources.
Names That Peaked Alongside Cybi
These names rose and fell in the same era, which is why they tend to sound like they belong together.
Parents Who Like Cybi Also Like
Names whose popularity has risen and fallen in step with Cybi over the last century — the same taste, a different name.
How to Say Cybi
- Welsh KUH-bee
Sibling Names for Cybi
Names from the same era that do not rhyme or share an initial with Cybi — the two things that make a sibling set grate.
Common Questions About Cybi
What does the name Cybi mean?
Its meaning has not been firmly established, and the name is known mainly through the saint.
How do you pronounce Cybi?
KUH-bee, with the first vowel like the u in cup.
Who was Saint Cybi?
A sixth-century saint, born in Cornwall by tradition, who gave his name to Caergybi, the Welsh name for Holyhead.
How popular is the name Cybi?
In 2025, Cybi was given to 5 babies in England and Wales. It is used consistently but remains uncommon.
Is Cybi a girl's or a boy's name?
Cybi is given almost entirely to boys in birth records.
How many syllables are in Cybi?
Cybi has 2 syllables.
When was Cybi most popular?
Cybi peaked in 2023, when 9 babies were given the name. It is a recent arrival in the birth records.
Is Cybi a good name?
That is not something records can settle, but they can tell you what you would be choosing. Cybi currently ranks #3,704 in England and Wales. It is a recent arrival in the birth records. Everything else — how it sounds with your surname, who it reminds you of — is yours.