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Is their family name "Real name" or something? Because definitely our boi Souma already know Keisuke and Miyabi's real name
I'd have to see the raws to see if they just translated it weird, but I assume the author simply dodged telling
us what their family name is, while Souma definitely knows. The problem is,
a lot of Japanese family names are ridiculously common, so even if he knew they both had the same family name, making him not assume any connection. If I knew a Jeff Jones and a Beth Jones, I wouldn't assume they're related, especially if I knew them through wildly different contexts.