Mr Pohiva died last Thursday in Auckland after being medevaced from Tonga the previous day.
RNZ Pacific's correspondent in Tonga, Kalafi Moala, said the large number of mourners overflowed from the Free Wesleyan Church's onto its grass surrounds.
The service was conducted by the President of the Free Wesleyan Church, the Reverend Dr Ahio, and a number of other ministers from other churches were also there, Mr Moala said.
