I wouldn't say so. Terra is Tina, Kefka is Cefca and Exdeath is Exdeath in the Japanese Dissidia scans, which tells me his name is and was supposed to be Exdeath. Just because an Esper is based on Exdeath doesn't mean Exodus has Exdeath's real name. Famfrit is based on Cloud of Darkness, but do we start calling Cloud of Darkness Famfrit because of that? No.