It'll be interesting what you do with last names like "van der waals" and first names like "Mary Jo" as well as people who have alphabet-soup after their last names and titles before their first names.

My recommendation would be to forget about splitting names especially since most people end up doing "fuzzy" lookups for names anyway. Unless you have an application that has people populate separate on-screen fields to begin with, trying to splits on names can be terribly frustrating.