Comments for the name Keiko

This must be a unisex name, because Keiko the orca was male.

No. It's definitely a feminine name.

It can also mean "joy child" or "grace child" or "revelation child" or "the beginning/opening of a letter child" or numerous other things. In the generations before me, this was an EXTREMELY common name (I know lots of Keikos).

As for being a unisex name, I can't speak for other languages, but no Japanese in their right minds would name their boys Keiko unless maybe they wanted him to get beat up or something. It's a very feminine name in Japanese.

Keiko (Kay-ko) is definitely a feminine name in Japan.

It is the name of a character in Yuyu Hakusho.

My friend used this as her anime character's name but I don't think she knows what it means.

Pronounced KAY-ko.

It may also mean firefly child.

Um, actually, it's pronounced "Kay-ii-koh".
ke = "kay"
i = "i"
ko = "koh"

Keiko can also mean "firefly child". The kanji for "hotaru" has an alternate pronunciation of "kei".

Keiko is pronounced kay-ko. Kei is a single syllable/kanji, pronounced as "kay", while the syllabe Ke would be more accurately rendered as "keh".

I think it is a cute name. I think there's a character on Ubi named Keiko.

Pronounced "keh-i-koh".

I always thought it was pronounced KAY-ko.
Kei=Kay
Ko=Ko

On Star Trek: The Next Generation and Deep Space Nine, Miles O'Brien's wife is named Keiko. She is a botanist and later a teacher.

A famous bearer is Korean actress Keiko Agena (3rd October 1973, Honolulu, Hawaii, USA).

Pronounced kay-ko.

It is not unisex because "ko" is strictly for Japanese girl names.

For example:
Haru is unisex but if you add a "ko", Haruko, it makes it a feminine name.

Keiko Agena (b. 1973 in Honolulu, Hawaii) is an American actress.

The killer whale from "Free Willy" was named Keiko.