Can custom logo on main Wiki redirects to the personal website?

Yes, you can set your personal URL website as URL for logo image on your XWiki. 

You have 2 methods:

1. See Can subwiki logo link point to main wiki? . No restart is required for this. The only minor change is you have to replace the following <a href="$!xwiki.getURL($services.wiki.currentWikiDescriptor.mainPageReference)" ... with <a href="<your_own_website_url>" ...
2. Edit the template file companylogo.vm from your XWiki data folder xwiki\skins\flamingo\companylogo.vm with above same approach. After saving the changes, restarting XWiki is mandatory.

After using one of the above methods, each time the user clicks on the logo on the main wiki, the user will be redirected to the set website URL.