Namesakes
Characters in Celtic Mythology:
5 characters
Fíachu Labrainne (a.k.a. Fiacha) (m) 
Fíachu Fínscothach (a.k.a. Fiacha) (m)
Fíachu Findoilches (a.k.a. Fiacha) (m)
Fíachu Tolgrach (a.k.a. Fiacha) (m)
Fíachu Finnolach (a.k.a. Fiacha) (m)
Irish Kings:
6 kings
King Fíachu Labrainne (a.k.a. Fiacha) 1095-1071 BC
King Fíachu Fínscothach (a.k.a. Fiacha) 975-955 BC
King Fíachu Findoilches (a.k.a. Fiacha) 863-833 BC
King Fíachu Tolgrach (a.k.a. Fiacha) 593-586 BC
King Fíachu Finnolach (a.k.a. Fiacha) 28-55
King Fíachu Sroiptine (a.k.a. Fiacha) 273-306