(2003) it is revealed that Logan's real name according to his birth certificate is actually Lobo. The name Lobo is a DC comics character while Logan is the real name (sort of) of Marvel comics character Wolverine.
Jimmy and Christine's son Logan's real legal name on his birth certificate is Lobo. When Christine was sedated while giving birth, Jimmy misunderstood that she wanted the name Logan. Jimmy thought she said Lobo.