Annas Idee: Genitiv mit Namen

With names, the Genitiv goes in front of the noun and takes a plain -s, without an apostrophe:

• Annas Idee, Peters Fahrrad, Frau Kochs Antrag
• names ending in -s, -ß, -x or -z take only an apostrophe: Klaus’ Garten, Max’ Bruder

The noun after the name has no article. In speech von is very common: die Idee von Anna.