Updated February 15, 2024

Table of contents

Find Baby Names

Boy name origins & meanings

  • Latin : Rejoice; variation of Gaius

Boy name variations

Caius

Caius

+ 9% this year
Masculine
Rare
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Caio

Caio

- 6% this year
Masculine
Rare
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Kay

Kay

+ 10% this year
Neutral
Rare
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Kaye

Kaye

+ 15% this year
Masculine
Rare
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Keye

Keye

0 % this year
Masculine
Rare
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Keyes

Keyes

0 % this year
Masculine
Rare
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Keys

Keys

0 % this year
Masculine
Rare
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Cais

Cais

0 % this year
Masculine
Rare
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How Popular Is The Name Cai

Family name origins & meanings

  • Chinese : from the name of the former state of Cai, in present-day Henan province. When the Zhou dynasty displaced the Shang dynasty in 1122 bc, the defeated Shang were allowed to rule in the area of their old capital of Yin, under the stewardship of Zhou appointees. However, these Zhou appointees, among them Cai Shu, the 14th son of Wen Wang and younger brother of the new king, joined forces with the Shang in revolt. After the rebellion was suppressed, Cai Shu was banished, but his son was granted the state of Cai along with the title Earl of Cai. His descendants later adopted the place name Cai as their surname. Other spellings of this name, due to dialect differences and variation in Romanization, include Tsai, Choi, Choy, and Tsoi.