Lookup field

Hi,

I created a account lookup field in one of my custom entity and it's database  field name is

new_xyz. Where as when I go to the sql server and when I query the new _xyz in my custom entity it is returnig me the GUID.  What I found in the custom entity table is a new field also got created with database field name new_xyzname, with 'name' as extension. And this field is having the actual data.

I am confused shold I use the new_xyz field which is giving me guid to send data to the external systems or the the new_xyzname.

Thanks