I'M SO SORRY FOR THE LATE ANSWER!!

Hmmmm~ In Toji's case, I think he took a bit to process he IS dating her. She's probably the first woman he dates like ?? Very Serious, with commitment and responsibility, so even if he didn't overreact or did something crazy the moment she said yes, I'm sure he went back to his place and stared at the ceiling for at least two hours while thinking about it. Didn't slept well, woke up in the morning and called her immediately to make sure if it did happen or if he just dreamed about it, it just feels ??? Wow, you know? To have the "boyfriend" title, HER boyfriend.

And about the name, I like to think it just came naturally to him. It seems gender didn't play any role on his choice so he must have felt "Blessing" was the right word to describe this baby, it doesn't matter how girly it sounds or whatever, it just fits. As soon as she asked for a name, he just said Megumi, a life he created with the love of his life despite the violence he suffered, a second chance, a new start, he can't think of any other name. They didn't use any other name.