* Country's new name polarises voters, looms over campaign
* Next president will not have power to veto name change
* Deal with Greece a pre-condition for EU, NATO membership
* Turnout may be low due to disillusion with politics (Updates with polls opening, quotes)
By Kole Casule
SKOPJE, April 21 (Reuters) - Macedonians vote on Sunday in a presidential election dominated by deep divisions over a change of the country's name to North Macedonia under a deal with Greece.
The change, which Greece demanded to end what it called an implied territorial claim on its northern province also called Macedonia, resolves a decades-old dispute and opens the door to Macedonian membership of NATO and the European Union.
But the accord continues to divide Macedonians and has eclipsed all other issues during campaigning for Sunday's election, in which about 1.8 million voters will choose between three candidates.
"We have to put an end to this. We need to stop the sale of our national interest," said Ilija Velkovski, a 67-year old pensioner, after casting his vote. "Yes, we want EU and NATO, but not like this."
However, the presidency has no authority to block constitutional amendments that were passed earlier this year by a two-thirds majority of parliament to enable the name change.
Reflecting differences over the deal pushed through by the pro-Western government of Prime Minister Zoran Zaev, the winner of Sunday's ballot is not expected to secure an outright majority, meaning a run-off vote would be held on May 5.
Polls opened at 7 a.m. (0500 GMT) and first results are expected around 9 p.m. (1900 GMT).
"I expect peaceful and democratic elections," said Dimitar Stankovski, a 42-year old legal adviser in a private firm after casting his vote.
"I expect that we elect a president that will take us into Europe where we belong. I know there is a long path ahead, but we need to start somewhere."
A recent opinion poll gave 28.8 percent support and a narrow lead to Stevo Pendarovski, who is backed by the ruling centrist coalition of the Social Democrats and the minority Albanian DUI party, which have promised to implement the name change deal.
Pendarovski's main rival, Gordana Siljanovska-Davkova, an university professor, is supported by the nationalist VMRO-DPMNE party, which strongly opposed the deal. The latest poll showed her on 26.8 percent.
Blerim Reka, the candidate for the second-largest Albanian party Besa, looks set to come a distant third with about seven percent of the vote, the poll showed.
Analysts say turnout could be low due to disillusion among voters at the government's progress in attracting foreign investment and tackling high unemployment.
The presidency of the former Yugoslav republic is a mostly ceremonial post, but acts as the supreme commander of the armed forces and signs off on parliamentary legislation.
The refusal of outgoing nationalist President Gjeorge Ivanov to sign some bills passed by parliament has delayed the implementation of some key laws, including one on wider use of the Albanian language - 18 years after an ethnic Albanian uprising that pushed Macedonia to the brink of civil war. (Writing by Ivana Sekularac; Editing by Helen Popper and Mark Potter)
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