The "normal" contact form (contact us page) has no first and or last-name option as far as i know? which form are you referring to?
Update:
When the e-mail address is not found in the database a message will only contain Hi, if the e-mail address is found in the database it will show Hello Crezzur Company, (Tested on my server)
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The "normal" contact form (contact us page) has no first and or last-name option as far as i know? which form are you referring to?