It should definitely be pronounced with a hard G if you use Attic or
Koine Greek (two of the most common ancient Greek dialects). The
section in the Wikipedia article is ambiguous. It says that "jiga" is
"a correct pronouncation" but then two sentences later it refers to
"giga" with a hard G as the correct pronounciation.

On 9/5/06, Gerhard Fiedler <lists@connectionbrazil.com> wrote:
> Luis Moreira wrote:
>
> > In Portuguese you pronounce it as "jiga" because a "g" followed by a
> > vole (except u) always reds as "J".
>
> Except a, o, u? (Which leaves e and i for the "j" pronunciation :)
>
>
> FWIW, it seems that the Greek original used something closer to the "g"
> sound. http://www.mail-archive.com/usma@colostate.edu/msg23248.html
>
> OTOH, http://en.wikipedia.org/wiki/Giga says "As giga is a greek word and
> greek is a phonetic language it is pronounced with a soft G as in jiggle."
> Not sure what the spelling of "greek" says about the factual quality of the
> phrase.
>
> I don't know Greek, so I can't say who is right (about Greek). The Greek
> Wictionary entry is not of much help to me
> http://el.wiktionary.org/wiki/%CE%B3%CE%AF%CE%B3%CE%B1%CF%82 :)
>
> Gerhard
>
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