I had the same problem - a quick fix is to open the meta file in a good editor and do a find / replace on the name fragment. In my Casecase I needed AbilityIcon_0XAbilityIcon_0X changed to UpgradeNodeIcon_0X. Find "AbilityIcon_" replace all with "UpgradeNodeIcon_"UpgradeNodeIcon_0X. So I did these steps:
Find "AbilityIcon_"Replace allwith"UpgradeNodeIcon_".
A scripted solution if there is a batch is always great. If you just need to do a handful this might be easiest