Please go back and look at the entries for
Ralph and
Rolf and the pronunciation key again. You will see that this site says that
Ralph is pronounced as
RALF and
Rolf is pronounced as RAHLF. If you check the pronunciation key:
http://www.behindthename.com/pronunciation.php
you will see that
RALF and RAHLF do
not designate the same pronuciation, but that this site is in fact saying the
Rolf would rhyme with golf.