How to create a model Class with fixed prefix

I have a dotnet core application. I added model class everytime with fixed prefix. It goes very lengthy and unhandled way. Is there any better way to handle this?

public class Category
{
    public string? gmailIN{ get; set; }

    public string? aolIN{ get; set; }
    public string? outlookIN{ get; set; }
    public string? yahooIN{ get; set; }
    public string? hotmailIN{ get; set; }
    public string? ZohoIN; set; }

    public string? aolAU{ get; set; }
    public string? outlookAU{ get; set; }
    public string? yahooAU{ get; set; }
    public string? hotmailAU{ get; set; }
    public string? ZohoAU{get; set; }
    public string? gmailAU{ get; set; }

    public string? aolUK{ get; set; }
    public string? outlookUK{ get; set; }
    public string? yahooUK{ get; set; }
    public string? hotmailUK{ get; set; }
    public string? ZohoUK{get; set; }
    public string? gmailUK{ get; set; }
        
    public string? gmailUS{ get; set; }
    public string? aolUS{ get; set; }
    public string? outlookUS{ get; set; }
    public string? yahooUS{ get; set; }
    public string? hotmailUS{ get; set; }
    public string? ZohoU{get; set; }
}

Prefix is always the same. Is there any better way to add variables instead of adding above way?

>Solution :

If possible split Category and Country.

You can create a class like:

public class Category
{
   public string? gmail{ get; set; }    
   public string? aol{ get; set; }
   public string? outlook{ get; set; }
   public string? yahoo{ get; set; }
   public string? hotmail{ get; set; }
   public string? Zoho{get; set; }
}

and then one Dictionary for mapping it with country

public Dictionary<string,Category> Categories;

or add the Country property inside the Category class itself.