Ahmad was one of nine Pakistani nationals murdered in the New Zealand city earlier the month, when a white supremacist gunman killed 50 Muslim worshippers in two mosques.
Ahmad's body was flown into Karachi and transported to a relative's house where family and friends gathered before heading to the cemetery for the burial.
"It was very painful for the parents and all of us to wait. His funeral is taking place now that is a bit of relief for us," said Ahmad's uncle Aleemullah Khan. "But his father is in so much agony as Areeb was his only son and the provider for the family," he added.
The other eight Pakistani victims were buried in New Zealand, according to the Foreign Office.
Pakistan posthumously awarded Naeem Rashid, who tried to tackle the gunman before being shot dead, with the order of bravery during Pakistan Day celebrations on March 23.
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