As a matter of fact, the posthumous names for Emperors Keiko, Richu, and Hanzei include 'wake' and there is a high possibility that these are Japanese-style posthumous names based on real names.
事実、景行天皇・履中天皇・反正天皇の各天皇の名にも「ワケ」が含まれており、実名を基にした和風諡号である可能性が高い。