Voynich through Phonetic Irish

[Doireannjane]

It is not "essentially" the same word! For starters, they have radically different phonetic values, so even if they are syntactically and semantically interchangeable you need to explain how you arrived at one over the other or you are relying on degrees of freedom. But as it so happens, in your chosen dictionary, they are syntactically quite different as one is a noun and the other is a verb, so a process for distinguishing between the two is not trivial. And even if you coerce the word meaning "elopement" into "elope" (which is a degree of freedom I did not notice before) so that the part of speech matches, eloping is a very different sense of going, usually meaning to leave home but also including the sense of running away with a lover or getting married to them, so the semantics here are, charitably, quite stretched.

Oh I don't think you understand, it actually is exactly like Athoige - rejuvenate. ATH OIGE. re-youth. 

Both athadh and a teidh mean the same and sound exactly the same in my phonetics they're just broken up. 
I'm using a historical téigh that is spelled téidh

Also you're thinking of modern elopement not old/middle english usage.