She didn't...
Sephiroth got Created by an experiment by Hojo.
Her name is Lucrecia Crescent, she was a Shin-ra scientist.
Ultimecia does not give birth to Sephiroth in the Final Fantasy series; this is a common misconception. Sephiroth is actually the son of Lucrecia Crescent and Hojo, a scientist from Shinra. Ultimecia is a powerful sorceress from Final Fantasy VIII and has no direct connection to Sephiroth, who is a character from Final Fantasy VII. Each character and their stories belong to separate narratives within the Final Fantasy franchise.
Sephiroth's father is Hojo, a famous scientist who is in Final Fantasy 7 and Final Fantasy 7 Crisis Core, and his mother is Lucrecia Crescent, who worked with him on the Jenova project.
No. Sephiroth's mother's name is Lucrecia Crescent. She became pregnant with Sephiroth while she worked on the Jenova project, along with the father, Professor Hojo, and agreed to allow her unborn child to be used as a test subject.
By default it would have to be Crescent because Hojo's last name has never been revealed.
Though it seems that there may be some kind of connection between Shelke Rui and Vincent Valentine, but alas, there is not. He is in love with Lucrecia Crescent, the scientist who birthed the ultimate evil, Sephiroth. She is mentioned often in DoC -FFVII- She encased herself in the crystals of the Crystal Cave because she felt "guilty" for what she had done ,i.e, giving birth to Sephiroth.
It is never really expounded upon in ANY of the FF 7 games, but my guess is maybe. If you look at it logically, Dr. Lucrecia gave birth to Sephiroth, and the father was Hojo. Now taking that into consideration, it COULD be speculated that Dr. Lucrecia loves Hojo, however creepy that may seem. But playing Dierge of Cerberus, and completing the Vincent side quest in the original 7, I say it is a strong possability. Signed, Phoenix
Sephiroth's last name was never mentioned and is not included in the game manual. It is unknown if he even has a last name. However, his parents are Professor Hojo and Lucrecia Crescent, so either "Hojo" or "Crescent" could be his last name.
No, they are from different games and have nothing to do with each other.
Sephiroth.
Beat Sephiroth also its Cloud's sword you get not Sephiroth's
Sephiroth was a war hero that Cloud idolized as a child. Hoping to be like him one day, Cloud tried to join Soldier. He was sent on a mission to Nibelheim as support to Sephiroth and Zack. In the reactor on Mt. Nibel, Sephiroth learned the truth about his birth and went mad. He burned Nibelheim, which was Cloud's hometown, to the ground and nearly killed Zack and Tifa. Cloud confronted Sephiroth, being injured in the process, and was able to turn Sephiroth's attack back on him. Because of Cloud's interference, Sephiroth was humiliated and his plan to 'take back the world for Jenova' was interrupted. This is pretty much all the interaction that the two had before the start of the game.