I just thought it'd be fun to share what I found when searching for etymology of "Rad(a)" and "gast."
Old Norse
ráð = 'advise', 'counsel', 'decision' [2] [3] [4] [5] [1] [6]
ráð = 'advise', 'counsel', 'decision', 'might', 'household', 'marriage' [7]
ráða = 'to advise', 'to counsel', 'to be...