> Hmmm. I am not aware of any direct equivalent to 'juga' in Germanic
> languages. Certainly, 'yoga'(long O) becomes Proto-Norse *yuka and
> Norse 'ok'(-it, a dyri) by the G-to-K rule (Indic to Germanic), but
> 'yuga' means something very different.

From a purely phonological standpoint I would expect an Old Norse relative
of 'yuga' to be 'uk' or 'ok' and an Old Norse relative of 'yoga' to be 'auk'
or 'jók'. Those would represent two or three different grades of the same root.

Indo-European u eu ou éu óu
Sanskrit u o o au au
Germanic u eu au eu au
Old Norse u jú au jú au

My etymological dictionary again suggests a link between Old Norse 'ok'
and sanskrit 'yuga'. In any case my attempt at humour was to translate
'satya-yuga' as "it sanna ok" - which of course doesn't make any sense :-)

Kveðja,
Haukur