Some auto-created contacts have their name as "last name, first name"
Front's dynamic variables will identify the name listed first as the contact's first name and won't take the comma into consideration when identifying the correct first/last name.
Front contacts don't specify a separate first/last name field and will only identify the first/last name in the order they're entered into the contact name's field. There currently isn't a way for the name field in Front's contacts to specify first and last name besides the order of the entered names. If the dynamic variables registered that if there is a comma between the names, then the first name would be the 2nd word (it isn't always going to be the first word) and the result wouldn't be "Hello 'last name,',"
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