Yes. Hemma of Gurk (see link), also known as Emma, was canonized January 5, 1938. Her feast day is June 27. Emma of Lesum (see link), sometimes known as Hemma, was venerated as a saint although not canonized. Her feast day is December 3.
Yes, there are a number of saints named Emma and any one of them would make a good patron.
No, she's a Christian.
There are several saints named Emma so you need to be more specific.
Emma Caulfield's birth name is Emma Chukker.
Emma Hay's birth name is Emma Loscombe Hay.
Emma is always a famous name my name is Emma and i know 3 others named Emma
Emma Samms's birth name is Samuelson, Emma.
Emma Shuckburgh's birth name is Emma Ashley.
Emma Tansey's birth name is Emma Purcell.
Emma Baron's birth name is Emma Barbon.
Emma Danieli's birth name is Fretta, Emma.
Sweet Emma's birth name is Emma Barrett.