Hi
but what I don't no is Ada walker birth name before she married my great grandad George walker
You can find that one of 2 ways.  You can look up the 1916 birth for Hannah Walker on freebmd which will give you Ada's maiden name
If you know when and where George and Ada married - you can look up their marriage on freebmd which will give her maiden name
Unfortunately - you have given no details of Hannah's birthplace and as you have posted on the travelling people board - there are no clues there
A possibility is this marriage if Hannah was born in Birmingham
September qtr 1909   
BYFIELD    Ada        Birmingham    6d   3     
WALKER    George Herbert        Birmingham    6d   3
There are a number of Walker/Byfield births on freebmd
You need to look them up on the 1911 census to check their details