Through Nginx how we can hide a part of url?

We are using a WordPress application with Nginx as web-server. Currently
we
are accessing profile page as http://geo.mysite.com/members/geouser/ and
is
working fine.

Can anyone please help me to accomplish the following that is when we
access profile page, in WordPress its should go to the url
http://geo.mysite.com/members/
http://geo.mysite.com/members/geouser/
but in browser or in address
bar
in browser it should not display something like
http://geo.mysite.com/members/
http://geo.mysite.com/members/geouser123
or
http://geo.mysite.com/members/
http://geo.mysite.com/members/user123/
etc…

So our need is in browser it should either hide or change real name but
inside application it should point correctly.

Can anyone please help on it.

Thanks
Geo