Currently the internal API can get an account by index (number) instead of the name, however when these are available over HTTP and RPC the value is assumed to be a string and the name of the account instead of the index.

As the account index can be restored from the seed, and the name cannot, I think this value should be preferred, if not the only option. The account name I think is informational only, rather than a reference point.

Handling both cases could potentially cause an issue if an account name was actually a number, so if both were an option it should be possible to specify which is being used.