When parsing leads from emails you'll mostly stumble on "Full Names", meaning one line which represents the given and family name of a lead. On the other, most CRM systems work however not with one single field for the name but expect you to provide the Last Name and First Name separately.
There is a text filter which you can add to the end of your parsing rule which will split up a Full Name into two parts. The filter can be found in " Refine Results Split First & Last Name". The rule behind this filter is the following: Take the last word a the "Last Name", the rest is treated as the "First Name" (if available).