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Who is the Fushiguro family name?

I'll take the original page in Japanese (Chapter 66)

The cloud I marked has the characters 婿 — marriage, wedding

入婿, means to enter someone's family

If translated literally, he entered another family after marriage, took someone else's last name

At that moment from the scan that I provided, Toji Fushiguro was married to Tsumiki's mother

That is, he tells Kon Shiu that he got married, and immediately notifies him about the change of his last name

Kon Shiu and Toji have known each other for 10+ years. Kon knew about the death of Mamagumi and the birth of Megumi, and at the time of Chapter 66 and when they met after the death of his wife, he knew Toji as Zenin. If Fushiguro was Mamagumi, then Toji would not have said about marriage, but would have said to Kon: I took my wife's surname/ I took my dead wife's surname.

But we see that the new marriage resulted in a change of surname

This proves that Fushiguro is Tsumiki's mother's surname