JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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When you edit the email alert under the "Email" wizard, you can see there that you can edit the subject line:
You will also need to fill out the "Sender Name" in the recipient details so that it won't be populated by the word "JotForm":
To learn more about the settings in the email alerts, this guide might help: https://www.jotform.com/help/30-Explanation-of-Email-Notification-and-Autoresponder-Settings
After making the said changes, try testing your form and see if the issue has been resolved.
If I misunderstood your concern, please do provide us more details. Thank you.