Why find command behaves this way?

Here is a terminal output:

paul@cube:~$ find / libhwinfo_cpu.so
...
find: ‘libhwinfo_cpu.so’: No such file or directory
paul@cube:~$ sudo find / -name  libhwinfo_cpu.so
find: ‘/run/user/1000/doc’: Permission denied
find: ‘/run/user/1000/gvfs’: Permission denied
/home/paul/hwinfo/build/lib/libhwinfo_cpu.so

Why the first invocation of find claims that libhwinfo_cpu.so doesn’t exist?