How do I know which name of a chord to use?

I'm typing a song I wrote and for a particular chord there are like 4 different names and none are even close to what I was thinking.
Here are the chords I'm using in the song
x22oo2
x32oo3
xoo23o
3xooo3
I'm using http://www.jguitar.com to get the chord names. I was thinking the first chord would be some sort of Em chord but an E variation didn't show up. So how do i know which of the other names to use???
Here are the chords I'm using in the song
x22oo2
x32oo3
xoo23o
3xooo3
I'm using http://www.jguitar.com to get the chord names. I was thinking the first chord would be some sort of Em chord but an E variation didn't show up. So how do i know which of the other names to use???