How to insert new values to WordPress user Firstname and Surname Fields via DB

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If you have the ID of the user you can do this:

wp_update_user([
    'ID' => $userId, // this is the ID of the user you want to update.
    'first_name' => $firstName,
    'last_name' => $lastName,
]);

You can update / insert almost all fields with this function. Take a look at the documentation here

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