Transact SQL :: Search For Users By Either Their Name Or Nickname

I am using a web service to search for users by either their name or their nickname. Users can type the persons name into a dot net text box that has a Autocomplete extender - which means it returns a list of user with each keystroke.

This works fine if I just search for a name.

select r.fname +' ' + r.lname
from users u
join log l
on l.riderid = u.riderid

where fname +' '+ lname like @item +'%'
group by l.fname , r.lname, nicknamellame

So if I am searching for Dan Brown When I enter a D I get all users whose name starts with D, A reduces the list to those that start with Da until you get a small enough list to find Dan Brown. This works - what I would like to allow is if they entered the users nickname (another column in the users table) it would also include those options: So, if Dan's nickname is DannyBoy typing that in would return the nickname.

select r.fname +' ' + r.lname
, nickname
from users u
join log m
on l.riderid = u.riderid
where (fname +' '+ lname like @item +'%')
or (nickname like @item + '%')
group by r.fname , r.lname, r.nickname
having max(l.[date]) >= '2014-01-01'

This does not work