This nickname he have by some fans. He is player have way to much nickname. This is crazy but for some reason he always have so many nickname.
V-Splinter
The Splinter
Kill Bill
Euro Kobe
Greek Nash
Oracle of Delphi
Greek Sensation
Billy the Greek Kid
V-Span
"T-Mac of Greece" this stupid thing comes from Van Gundy and Rocket fans but now he cannot escape this one now
Just so many nickname for some reason with him. Main nickname is Kill Bill though this is REAL nickname but others are use many time to.
Greek Steve Nash I think come from how he will make same pass that Nash make and he will run pick and roll same as Nash. Basic every type of pass Nash make he also make exact same pass. Both player must be teach same exact way of make pass. So I think this how he get the "Greek Nash" nickname.
he lead Greek league in assist remember FIBA assist is not same as NBA assist. If player dribble or make move or pump fake or any such thing even wait second after get pass before they shoots the ball it NOT count as assist. Also many time assist must be consider as going straight to basket or it NOT count as assist which can mean open shot for teammate not count as assist.
So Spanoulis average over 5 assist in Greek league (he was not allow run pg in Euroleague because Saras have in his contract he was to be PG of Euroleague games) but American NBA fan think this is not "point guard" assist # because in NBA game this is low # for point guard. But in FIBA 5 assist is Nash like number. 5-6 assist in FIBA is best passers of world. Even Pepe Sanchez or Papaloukas will get 5-6 assist at most in FIBA. Nash will get 5-6 assist in FIBA.
And Spanoulis get 5 assist but only play 23 minute a game. He also have 2 other point guard on his same team with is Jasekivicus and Diamantides and so assist # will be affect by this but even they not comparable to his passing. He is easy by good amount best passer in Greek league.
I think Papaloukas best amount ever he get for year was 5 assist average in Greek league and also this lead league. Papaloukas consider best passer of Europe by many or also Pepe Sanchez was I think Sanchez only average 3-4 assist in Greek league when he play with PAO (which is same team of Spanoulis). You need see on youtube what passes such player like Papaloukas and Sanchez can make and understand Spanoulis average more assist then these same player in same league or even same team but in play less minute.
So he is similar as Nash in assist number. But in some other ways of game he is little bit different.
I not know how Spanoulis compare to Nash if he is "most like" Nash or if he closer to other player for compare to type of NBA player but he is one of best play maker of Europe for ability to get assist.
Actual if Suns was smart they would want him as Nash backup and let Nash teach him he can run same exact offense Suns do. Suns have never ask about him and his agent say they never interest. of all NBA team this is best fit for him because he run pick and roll exact same way as Nash and his way of drive and kick ball is same exact.