Namesakes
Characters in Celtic Mythology:
10 characters
Eochaid Étgudach (m) 
Eochaid Fáebar Glas (m)
Eochaid Airem (m)
Eochaid Feidlech (m)
Eochu Mumu (a.k.a. Eochaid) (m)
Eochu Apthach (a.k.a. Eochaid) (m)
Eochu Uairches (a.k.a. Eochaid) (m)
Eochu Fíadmuine (a.k.a. Eochaid) (m)
Eochu mac Ailella (a.k.a. Eochaid) (m)
Eochu Ailtlethan (a.k.a. Eochaid) (m)
Irish Kings:
13 kings
King Eochaid Étgudach 1159-1155 BC
King Eochaid Fáebar Glas 1115-1095 BC
King Eochu Mumu (a.k.a. Eochaid) 1071-1050 BC
King Eochu Apthach (a.k.a. Eochaid) 726-725 BC
King Eochu Uairches (a.k.a. Eochaid) 633-621 BC
King Eochu Fíadmuine (a.k.a. Eochaid) 621-616 BC
King Eochu mac Ailella (a.k.a. Eochaid) 577-570 BC
King Eochu Ailtlethan (a.k.a. Eochaid) 285-274 BC
King Eochaid Feidlech 94-82 BC
King Eochaid Airem 82-70 BC
King Eochaid Gonnat 244-245
King Eochaid Mugmedón 344-351
King Eochaid mac Domnaill 569-572
Saints:
1 saint
Saint Dallán Forgaill (a.k.a. Eochaid) 530-598
Scottish Kings and Queens:
4 kings
King Eochaid Buide c. 609-629
King Eochaid Crook-Nose 697
King Eochaid mac Eochaid 726-733
King Eochaid 878-889