why is grep behaving this way ?

["Bhasker C V" <bhasker@unixindia.com>]

I have logname command give me this output

[bhaskerv@cvsrep01 ~]$ logname
bhaskerv
 

and say i execute this command

 

[bhaskerv@cvsrep01 ~]$ echo `logname`
bhaskerv
 

till this it is all fine

 

BUT

[bhaskerv@cvsrep01 ~]$ who | grep `logname`
logname: no login name
Usage: grep [OPTION]... PATTERN [FILE]...
Try `grep --help' for more information.
 

 

is there anything i am doing wrong ?