It is really a very necessary thing to do. I felt the necessity 07 years ago. Let me share with you an experience. After I had married, I felf I should rename my wife's contact in my phone. I thought if something went wrong & I had the mobile phone with me, whom should someone call to help me. Definitely, my wife would be the most important target. She could manage all other things whatever required. So, I rename her contact as "Wife" and changed my contact in her phone as "Husband". It is still so in our phones.
During last Ramadhan, I felt sick in the office & fainted down instantly. Then a lot of things happened. After sometime I understood that I was admitted to the hospital & I found my wife by me. All other things were duely taken care of. I came to know, the doctors searched my pocket & found a mobile phone. They checked the call-list & found the name "Wife", and you can now understand very clearly how things went right afterwards. The result came after 07 years.
Whatever, mechanism someone follows, there should be an easy way to trace the right person in emergency & help him. A nation-wide convention is a real good idea on top of it.
BR,
Mamunur Rahman