However, if you are talking about this[1], the name can only be shown inside blockchain.info and nothing else. You won't be able to see ranochigo when you send Bitcoins to that address as stated before, unless you are using anything related to Blockchain.info. It is stored in the server, if they go down, the tags would all be gone. You can set it here[2].
i mean like 134mynameGDGSwU6AnkgSEqP3kZ2cKqruh
my name part of my BTC address
If you use a web site like the one above, someone else does know your private key, perhaps more than one. It is never a good idea to share it with anyone no matter how trustworthy they claim to be.