Over the years I have seen many different variants of my first name, Jeffrey. This is an attempt to catalogue some of them. 400 examples were found on the Internet using the Google search program. The subset below contains 124 apparently genuine variants, all of which are probably pronounced more or less the same as Jeffrey. The ones with a plus are recorded on the Kabalarians online name database (www.kabalarians, "How important is your name?"), and those with an asterisk are old forms.
"From Djeffrey to Jyfree,"
Word Ways: Vol. 38
, Article 17.
Available at: http://digitalcommons.butler.edu/wordways/vol38/iss4/17