Hi @Edyta7510,
This is now possible with the ability to customize the default deal name (instead of “-New Deal”) for deals created from existing contact and company records and it’s now in public beta! To get access, click on the dropdown in the upper righthand corner of HubSpot, select “Product Updates” and select “In Beta.” Scroll down until you see the Beta called “Customize Default Deal Name” and click “Join Beta.” Hope that helps!
For more info, please visit the Knowledge Base article