Hi @AngeloITA,
Thanks for sharing this question with us.
“Friend” will only appear in the absence of the “first_name” field. As long as a value for that field exists (in your case, the value being “Newsletter Subscriber”), we will populate that value as the first name using that tag.
Instead, I recommend exporting these users’ names from Mailchimp (include the First Name, Last Name and email address fields in the export) and re-import them into Klaviyo. You can upload them into a new list or to an existing one. As long as the email addresses in Klaviyo matches what you have in Mailchimp, we will not create duplicate profiles for these users but both first and last name will be updated in Klaviyo.
I hope that’s helpful :)