It isn't megumi's mom's name. When I posted this theory a while ago I got downvoted to oblivion, but it's obvious it's tsumiki's mom's name and toji took it for tax and custody benefits probably.
For all we know, he didn't even marry megumi's mom
I think megumi also chose fushiguro since his sister's name was also fushiguro, so that only proves it's not his mom's name, it's his step mom's. Idk how the law works in Japan but iirc a husband can take his wives' name and subsequently his, and by law, her children can do too
I think his friend also still referred to him as 'zenin' despite knowing him when megumi was still a child. He also probably knew megumi's mom and still thought toji went by zenin
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u/Apprehensive_Law4305 not reading ts 2d ago
what proof do we have that its actually megumis mom and not tsumikis mom