If the full name is in A1 column, then copy the following and paste on another column. Select all rows and paste to those cells as well.
=IF(ISERROR(split(substitute(REGEXREPLACE(A1, "[^a-z. A-Z]+", "")," ","~",1),"~")),,split(substitute(REGEXREPLACE(A1, "[^a-z. A-Z]+", "")," ","~",1),"~"))