In these regions (probably most of Nigeria) there was a lot of overlapping village names from some old import, most of the overlapping ones were very similar so when I stumbled upon some of these I added one as alt_name. I think the nodes from these old imports were later removed if they were not modified at all. https://www.openstreetmap.org/changeset/2529746#map=6/9.36/8.73
In some regions this import was very bad as you can see in this conversation.
