What is the (MN) state and federal laws regarding the use of an alias on legal and puplic documents?

i plan on changing my name in due time…though it is not top on my priority list..

i heard once that one could start using there alias on legal documents and over time the government would officially change your name to the one you used on officially documentation over the years…

is this real…if not

can i still use my future name until i legally change it…and to what extend can i without legal ramifications