I hate people with hyphenated surnames. When I ask for their name over the phone, I always just take the last word as their surname and call them that. Then when I load up the details and see it's a hyphenated name, I feel like a moron.
Also, in a reverse, I had an Indian woman give me her name and it was Sophie then some multi-syllable word. I asked if it was alright if I called her Sophie, which was fine, then when I loaded up her details, I realised she had given me two middle names and her surname was like Malik or something. Mrs Malik is easy!
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Still the number one reason for the success of the Internet.