My question involves name change laws in the State of: Florida

I was wondering how would i go about changing my daughters hyphenated last name. I am the only person on their birth certificate. When they were born I was with my girlfriend at the time and thought at the it was a great idea that I hyphenated and give them hers and mine. Now I would like to drop it. Do i have to do a name change? I feel it's so expensive just to drop a name. Or was wondering if there is a easier way to go about it?