But the backstory is that by the time Seth’s mother was pregnant with him, there was resentment between her and her husband. She felt trapped in the mafia world, and with her older son, Vincente, being raised to be very much like his father, she was determined to keep the younger son “for herself”. With a heir to the business already there, Dino let her choose the name, and she chose Seth, a foreign name that apparently isn’t even easy to pronounce for native speakers of Italian. She did so to signify her autonomy, to piss off her husband, but also to separate Seth from the very traditionally-minded environment. It was also a name that Seth’s mother believed would allow him to thrive outside of Italy.
For a more detailed explanation, read THIS POST.