[SDMUA-091] I will drink sperm for the first time in my life! Saitou Kasane

Googled some, inspired by your comment

Found this

“In Japanese, a long vowel and a short vowel are distinctive. For example, 小野 (Ono/ small field) and 大野 (Oono/ big field) are different names.

So Saito and Saitō are different. Saitō is a quite common and written 斎藤, 斉藤, 齋藤, 齊藤 and like that. 藤 is a name of a tree and it means they are originally from 藤原 (Fujiwara) cran. 斎 means a funeral or Buhdism celebrations. On the other hands, Saito is not so common but I found 西戸 which means “a west door”. According to this article, there are 890 西戸さん and their names are pronounced Saito, Nishito or Nishido. Their name is originated in Kagoshima.

名字由来net｜日本人の名字99%を掲載!! 西戸さんの名字の由来

However, some Saitō san write their names as Saito because there is no long vowel in English. I even don’t know how to type ō and copy-and-pasted from your question. Some people write it Saitoh and original Japanese spell is さいとう and it should be spelled Saitou.”

Wikipedia said:

“Saitō, Saito, Saitou or Saitoh (written: 斉藤 or 斎藤) are the 10th and 11th most common Japanese surnames respectively.[1] Less common variants are 齋藤, 齊藤, 才藤 and 齎藤.”