The StaticName is the internal ID of a Content-Type. You should usually not change it, but sometimes you need to. 

Make the Change

1. Go to the App-Management > Data
2. Enter Debug-Mode
3. Open the Content-Type Specs - you should now see the static name. Change it. 

Special case if this doesn't work: This is broken in 2sxc 10.20 through 10.25. In this case, please make the change in the DB. 

Fix References

1. Go to all views that used this Content-Type - their configuration is now invalid - and select the type again