Cai vs Llewelyn

Cai is a Welsh boy's name meaning A classic Welsh name derived from the Latin Gaius, meaning rejoice, while Llewelyn is a Welsh boy's name meaning An ancient royal name likely meaning leader or like a lion. Cai is the shorter of the two at 1 syllable.

Cai

/KYE/

Meaning
A classic Welsh name derived from the Latin Gaius, meaning rejoice.
Origin
Welsh
Gender
Boy
Syllables
1
Letters
3
Nicknames
Kai, Caius, Caio, Kay, Kaye
Loved
0 times

Cai is a traditional Welsh name derived from the Latin name Gaius, which originates from the verb 'gaudere' meaning 'to rejoice'. In Welsh mythology and Arthurian legend, Sir Kay (Cai Hir) was King Arthur's foster brother and seneschal, appearing as a heroic figure in the Mabinogion.

Full Cai name page

Llewelyn

/loo-EL-in/

Meaning
An ancient royal name likely meaning leader or like a lion.
Origin
Welsh
Gender
Boy
Syllables
3
Letters
8
Nicknames
Llywelyn, Llewellyn, Llew, Llyw, Lewellyn
Loved
0 times

Llewelyn is a traditional Welsh name derived from the Old Welsh 'Llywelyn'. It is composed of the elements 'llyw', meaning leader or ruler, and the suffix '-elyn', though it is also popularly associated with 'llew', the Welsh word for lion.

Full Llewelyn name page

How to choose between Cai and Llewelyn

  • Sound: Cai runs to 1 syllable (/KYE/) and Llewelyn to 3 (/loo-EL-in/). Cai pairs more easily with a longer surname.
  • Heritage: Both names share a Welsh background, so neither leans further from your family's roots.
  • Nicknames: Cai shortens to Kai, Caius, Caio. Llewelyn shortens to Llywelyn, Llewellyn, Llew.
  • Usage today: The name remains highly popular in Wales and among Welsh-speaking communities, often chosen for its brevity and deep connection to Celtic folklore. The name remains a staple of Welsh identity and is frequently used in Wales to honor national heritage. In modern contexts, it is often shortened to 'Llyw' or 'Lew' for everyday use.

Cai vs Llewelyn: common questions

Is Cai or Llewelyn easier to pronounce?
Cai is said /KYE/ with 1 syllable, while Llewelyn is said /loo-EL-in/ with 3 syllables. The shorter one is usually easier for young children to say.
What is the difference in meaning between Cai and Llewelyn?
Cai means A classic Welsh name derived from the Latin Gaius, meaning rejoice. Llewelyn means An ancient royal name likely meaning leader or like a lion.
Which is more popular, Cai or Llewelyn?
Cai and Llewelyn are loved equally often by visitors here (0 each).