If you send a standard e-mail as an invitation, the salutation is the default on:
Dear Sir / Madam
Do you want to adjust this? Then go to "Communication" and "Email management" in the menu. Apply the editor or the source code the salutation in the text.
If you want to use names of respondents, you can import this data as data enrichment. Follow these steps to have your own data reflected in the questionnaire or emails.