sometimes the output of "sp_who" limits (truncates) the size of the database name in it's output.
so, you might want to shorten your search string:
sp_who
go | grep 'ANDREAS'
A better way would be to query the sysprocesses table:
select spid,suser_name(suid),hostname,program_name,db_name(dbid)
from master..sysprocesses
where dbid = db_id('ANDREAS_20150511')