I exchanged some nice messages with a man on an online dating site. He suggested swapping numbers so we could chat. I gave him my number and he messaged me. I replied asking him what his surname is and giving him mine. His response was, ‘that’s a bit random. Do you want to do a credit check on me 😂?’ He did give me his surname but I found is response off-putting. Aibu to ask for a surname? Or am I not being unreasonable and his response is odd?