getRecordTypeInfosByName() looks for Label.
After summer '18 preview, Salesforce is going to support getRecordTypeInfosByDeveloperName()getRecordTypeInfosByDeveloperName() delivered: https://developer.salesforce.com/docs/atlas.en-us.214.0.apexcode.meta/apexcode/apex_methods_system_sobject_describe.htm
Example: (Change your record type developer name in below example)
system.debug(Case.sObjectType.getDescribe().getRecordTypeInfosByDeveloperName().get('Customer_Success_Support').getRecordTypeId());