If you upgrade your personal PayPal account to a PayPal Business account, you can specify a Business Name in your PayPal profile settings that would appear during checkout and elsewhere in payment references, in place of your PayPal Email address. Upgrading to a Business account is free and generally a good idea anyway, as it lifts the monthly payment-receiving limit on personal accounts, among other business-minded amenities.
Also, you can go to your E-junkie Seller Admin > Edit Profile > Upload Your Logo to provide a custom logo/header graphic that would appear in the header of your PayPal checkout pages, as well as other pages that E-junkie generates for your account such as your thank-you pages.
