Well, essentially what the title says. Where do the Faroese <ggj> and <gv> come from? The ones I mean are from words such as <nógvur> and <trúgva>, with Icelandic cognates <nógur> (?) and <trúa>, and <nýggjur> and <oyggj> (regular change of "ey > oy") with Icelandic cognates of <nýr> and <ey>. I'm interested in the historical aspect of it, not the synchronic - could anyone help me?