Among the complainants is disabled children's charity Action for Kids, which last week said it would be consulting its lawyers over NCH's plans to re-adopt its former name, which it trademarked in 1994 but stopped using in 2000 (Third Sector, 11 June).
"We have received a mixture of concerns that the proposed new name for NCH will cause confusion and requests for clarification on the regulations and the commission's policy on this issue," a commission spokesman said.
Mike Hayes, chief executive of Action for Kids, said donors frequently confused the two charities when NCH last used the strapline Action for Children. He said his charity often received post for NCH - including a cheque for £108,000 on one occasion.
Hayes disputed a statement from NCH that it had written to Action for Kids before the name change, but received no response. "Action for Kids has communicated its views to NCH several times over the past 14 years," he said. "In 1993 we complained strongly to the Charity Commission."
Hayes also refuted NCH's claim that his organisation became a charity only in 1998, saying that it had actually been a charity since 1992.
A spokeswoman for NCH said the charity had no record of approaches from Action for Kids over the years.