A pox o' chads on your house, ya mewlin' landlubber!
In fact I don‘t remember a suffix which attaches to a pronoun. In modern Icelandic at least we like to introduce more pronouns or conjugate them rather then to suffix or prefix them.
If the word was broken as vi-kingur, I think the modern Icelandic would be við-kingur (or við-lingur), which is simply not a word in the language.