Delta State:
OSHIMILI, NDOKWA, UKWUANI, ANIOCHA, IKA, NDONI, AGBO, ASABA, ISELE UKWU/UKU; this are all Igbo extraction in delta state, and they are of the same ancestry lineage. The ancestor name is EZECHIMMA who is medicine man that originated from arochukwu in present day abia state. Thou Ezechimma met some people in some places they settled, place like Ogwashi-ukwu, Idumueje, Onisthia and rest.

River State:
IKWERRE, OGBA, ETCHE AND EPEYE; this is an Igbo extraction in river state, and they are of the same ancestry lineage. There ancestor name is AKALAKA, thou before the arrival of AKALAKA from Benin kingdom there is already some people leaving in ikwerre land and the people leaving in ikwerre land before the arrival of AKALAKA from Benin kingdom originated from orlu in present day imo state. AKALAKA is a warrior which also originated from arochukwu in present day abia state.

OPOBO; this is also an Igbo extraction found in river state. There ancestor name is KING JAJA OF OPOBO he is also a warrior/warlord, who originated from Jubo Jubogha Umuduruoha Amaigbo, in present day IMO State.

EGBEMMA; this is also an Igbo extraction found in river state. The egbemma have a strong Igbo cultural identity, despite their location on the southern fringe of Igbo land. The kingdom traces its origin to Igbo land centuries ago. Egbemma is under the overlordship of the NZEOBI of egbemma kingdom and EZE SUNDAY UZOR. Egbemma originated from IMO state and egbemma is made up of seven villages.

OMUMA: Omuma people is an Igbo extraction, also found in river state, which originated from orlu east in present day IMO state. Omuma people in river state is made up of several town and villages such as UMUABALI, UMUROKE, EBERI, EGBELU, UMUOKWA, UMUOYORO and UMUDIK.

Veracity laced with fact.
I have been to a particular village in Abia state for a Reverend Father's first mass and I was so surprised how I could hear them when they speak their dialect, I was forced to ask how come it was so. Too bad I cannot remember the name of the village.

Omuma and Egbemma are both in Rivers and Imo

Una don come again, always they link other people to Una sef for Una identity crises.

If it is by ancestry linkage, if you go back far enough in time, we are all related.