I don't have one and haven't missed not having one. I find it a bit strange when people always use more than one name like Carol Ann. Ellie May John Paul etc, and find hyphenated names puzzling unless you're French (Sarah-Jane, Ellie-Mae, Lexi-Rae etc). Names joined together just strike me as mistakes (Ellalouise, Sarahjane, Jonmartyn etc).
Each to their own I suppose.
How about when people have several names and surnames?
e.g. Evie-Kate Florence Sophia Madeleine Adams Wolseley-Snipe (I made it up but ykwim)