Should our daughter have mine or my boyfriends last name?

We aren't married and I'm not sure that we will get married in all honesty. We've been together for around three years (with a break in between) but we are a strong unit and I do think we'll stay together. However, I'm not sure that I want to have a different name to my daughter and SO? He is VERY work oriented (and focussed on himself...) so I will be raising her for the most part and will stay off work to look after her until she goes to school...what's your opinion? Honesty please! 

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