you can also turn off notifications to the old email....
I was also in this situation, I wanted to change to my work. I eventually talked myself out of it since I had 2 apps I would have to re-purchase. Would have cost $15 but I just dind't want to do that.
I have 4 total gmails. I set 3 of them to notify me when I get emails.... one I do not care about (I only have it so I can have an extra color option on my calendar for reffing) all that happens is it gets spammed anyways as my ref info comes to my work email. I just don't want to list ref events in the same color as my work meetings.
but, look around at google website, there may be a way to account for name changes based on weddings.... I know with google corporate mail, we deal with that. And at least for a while, it still sends to the new name, even when you use the old name. But that was an older mail client, not google.