Name change becomes mandatory in case if one's name has a meaning which is not within the line of one's new faith.

It could also be to project/indicate the change of religion. However it is always better to change the name for all good reasons. And yes the family/father name cannot be changed.

And further, to my best understanding one does not change his/her faith to get snaps published in press and gain money out of it. This is a serious matter more than money.

Peace