The page had raised more than $5000 at the time of writing.
In a post on social media, Leonidas' mother said she was "shattered" by her son's death.
"I'm shattered with no words ... loving all the love and thanking you all," she wrote in reference to those who helped search.
A rahui has been placed on the river from Wednesday through until one day after Leonidas' tangihanga.
Upper Hutt Mayor Wayne Guppy said he was saddened by the news of Leonidas' death, and also thanked all the agencies who supported the search efforts.
"My sincere thoughts are with the family at this difficult time and myself and council will continue to support in any way we can."