combine.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

names_file = 'names.txt'
father_names_file = 'father_names.txt'
combinations_file = 'combinations.txt'


def main():
    with open(combinations_file, 'w') as combinations:
        with open(names_file, 'r') as names, open(father_names_file, 'r') as father_names:
            names_lines = names.readlines()
            father_names_lines = father_names.readlines()
            for name in names_lines:
                for father_name in father_names_lines:
                    line = "%s %s" % (name.replace("\n", ""),
                                      father_name.replace("\n", ""))
                    combinations.write("%s\n" % line)

if __name__ == '__main__':
    main()

father_names.txt

Иванович
Степанович

names.txt

Иван
Степан