Background... babydaddy and I are in a long term relationship. Neither of us find marriage important otherwise we would do it. Being pg (first child for both) has raised the whole marriage / surname issue. More about practicalities, e.g. would it be easier to get married or sort out the legal stuff in another way?
My thoughts are, I'm not in love with my surname but I've never been comfortable with the wedding business where a girl is handed over from one man to another and takes the new man's surname. Basically my position with any tradition/convention is "why follow it?" rather than "why not?", so even if we did marry it's not certain that I'd "take his name". The admin around informing everyone seems like a pain in the ar$e! Of course it'd be easier if we married aged 16 and didn't have a professional life or a driving license or our own savings accounts 
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So while discussing baby names the surname question came up - our names are quite different so it is relevant to choosing the first name. Babydaddy was initially fine either way but now he's had time to think about it, he's more keen on using his name.
Double-barrelling or using one surname as a middle name isn't an option.
What would you do?