Technically, it's 100% possible to make a coin with the exact same name. It's possible to get the sourcecode on github.
If you look at my page:
https://github.com/merelcoin you can clearly see that i forked, for example, GenesisH0. It has the exact same name as the original, but it's just saved under my username.
However, as being said before, releasing a coin with the same name as an other coin will lead to a lot of confusion, and a lot of sites will probably refuse to list your coin if it has the same name as an existing one