As Dave M wrote, Jollys'. However, it is not unusual to omit such an apostrophe from business names; it's more a matter of style and personal preferences than "correctness" when it comes to names. By employing the apostrophe (Jollys') you would be following punctuational convention and might face less criticism or adverse comment from those who think they know it all.
First option: Jollys' Second option (slightly controversial but far from unusual): Jollys.
"Style is knowing who you are, what you want to say, and not giving a damn." — Gore Vidal