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Giannakopoulos (pronounced Y(i)annakopoulos in greek) is
derived from the first name Yannis (= John).

Y(i)annakos is one of the diminutives for Yannis,
so it means something like little John.

The ending '-poulos' is very common in Greece and
denotes the 'son of'.

So Giannakopoulos means the son of little John.

About gamma.
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The third letter of the greek alphabet is gamma
and there is not a consonant sounding similar in
english. In many cases Greeks prefer to use "G" for
"gamma", because "g" in many english words (especially
those derived from greek) substitutes "gamma".
E.g., "Georgios (sounds like Yeoryios)" = George.

In the case of "gamma+iota+any vowel" the sound "gamma+iota"
is reproduced exactly as "y+any vowel".