On Planet Saharan, before it was called Planet Scavadania, Princess Lia was giving birth to her third child as her children were on a mission with their father. Lia's sister-in-law, Yala, was there to take care of her as she was delivering the baby with her.
Yala: Alright Lia, now push!Lia grunted and starts to scream as she pushed harder.
Princess Lia: Ahhhhhhhhh! 💢
Yala: Push harder!
Lia keeps on screaming as she was receiving more pain.
Princess Lia: Ahhhhhhhhh!💢
Yala: Wait, I see the head. Just a bit more.
Princess Lia was pushing with all of her might until she heard a sound of an infant crying. Yala was cleaning the Saiyan baby and wraps it under a soft blanket.
Yala: So Lia, what're you gonna name the baby?
Princess Lia: I know that it's a boy and I think his power level is-
Yala puts on the scouter and the baby boy's power level is 500.
Princess Lia: His power level is 500?! I thought it would be 9000 or something. I think I'll name him, Zero.
For many years till the future, a Saiyan named Zero or Zaydon has become a Super Saiyan God.