The problem appears to boil down to:

• opening the file containing the names you wish to match, and reading that into some data structure that you can use to match with. Perl hashes good at exact matches.

• opening the other file, and reading it line by line.

• parse the line in some way to identify the names it contains. You may be able to split it, or you may need to use a regular expression.

• see how many (if any) of those names are in the collection of names you want to match.

• decide what to output, and do that.

I imagine that matching names may be small challenge. Does, for example 'harry' match either 'Harry' or, indeed 'Old Harry' ? But otherwise, this looks straightforward enough. What have you tried ?