They include an Australian mother and her 10-year-old daughter and three children of Danish billionaire Anders Holch Povlsen, the man behind online fashion retailer ASOS.
Jesper Stubkier, communications manager for Bestseller, confirmed to the Press Association on Monday that three of Povlsen's children were killed and declined to comment about the identity of the children.
He owns more than one percent of all the land in Scotland after buying a large number of historic estates.
The death toll for the attacks now stands at around 290 people, including eight Britons.
"It's a significant and lifelong commitment that we have made - not just for ourselves but for the Scottish people and Scottish nature too - a commitment which we believe in deeply".
Sri Lankan authorities said on April 22 that authorities arrested 24 people in connection with the attacks, which left at least 290 people dead and another 500-plus injured.
Eight coordinated explosions triggered by suicide bombers targeted Easter worshippers and high-end hotels popular with worldwide guests.
"Unfortunately, we lost our citizens, Serhan Selcuk Narici and Yigit Ali Cavus, in the treacherous attacks in Sri Lanka", the agency quoted Turkish Foreign Minister Mevlut Cavusoglu as saying.
As per reports, the blasts happened by 8.45 am when Easter Sunday masses were progressing in the churches as said by police spokesperson Ruwan Gunasekera. BBC News confirmed the death of the fashion mogul's three children.
The company didn't provide any further information "out of respect to the family". The women and their family were eating Easter breakfast in a restaurant in the upscale Shangri-La hotel in Colombo Sunday morning when the bombs detonated.
Investigators said seven suicide bombers took part in the attacks while a government spokesman said an global network was involved.
Visitors from Turkey, India, the UK, Portugal, China and Australia are among the victims.