Johans surname is Jinton too???

I have no idea why I need to figure this out, but how is Johans last name Jinton?

Did he take her last name? I know we are in 2024 but it's still not very common for that to happen, though I love to see it. I know some families hyphen their surnames and take each others which is cute but could get very out of hand 3 generations down with 6 surnames...

But back to this....Jonna has always used Jinton before Johan, and her mother has the last name Jinton too...so I'm abit perplexed!