Hi syntex
1. I added a field "old name" as Muhoza for Ruhengeri. Source of the name Muhoza was found here:
https://en.wikipedia.org/wiki/Ruhengeri
Maybe alt_name is more appropriate?
2. Previous changeset by another user (https://www.openstreetmap.org/changeset/130143482) removed the tag "name" of Gisenyi, leaving the city with no name. I added Rubavu in the blank name field to fix it. 
3. Changed Byumba to Gikumbi. That was a mistake it seems. Apologies!
