My girlfriend & I aren’t married and have no intention of ever being so.
Her surname is Fox, mine is Handy. Why should our children be Handys when their mother’s name is Fox? The automatic assumption that children should have their father’s name is an anachronism from our patriarchal society that had women as subservient possessions of their husbands.
There is no valid argument for it other than personal choice, and personal choice makes a hyphenated name, the use of the mother’s surname, or indeed a different name from both parents just as valid as any other.
So our children both have the surname Foxhandy.
We’re far too pretentious for a hyphen. 
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