Strange form submissions from fake accounts

Hi all. I made a site for a client which included a contact form but we have received some strange submissions with fake names, emails that are not with the name and link to sites like, and the message will be something like ‘shoes’. The site is very new so will not be found easily on Google. Does anyone know why we have received submissions like that this and if it’s something we should be careful about?

Here is my site Read-Only: LINK
(how to share your site Read-Only link)