The ANC breakaway group has settled on SA Democratic Congress as its new name, spokesperson Mbulelo Ncedana said on Monday.
The movement, which plans to launch as a political party on December 16, will begin the process of registering the party on Monday morning, he said.
"We are busy with that this morning (Monday)," he said.
After a convention held in Sandton over the weekend, delegates from provinces proposed names and the interim steering committee, which includes former defence minister Terror Lekota, his deputy Mluleki George and former Gauteng premier Mbhazima Shilowa, made the decision.
The party's name has to be registered with the Independent Electoral Commission for it to contest next year's elections.
The name SA National Convention, which it used for this weekend's get-together of about 6 000 people was contested by the ANC.
Early morning radio hosts pointed out that the acronym SADC is the same as that of regional body the Southern Africa Development Community.
Meanwhile, it has emerged that South Africa already has a party called the South African Democratic Congress.
The organisation is not represented in parliament but it is registered with the IEC.
It's leader is former Inkatha Freedom Party secretary-general, Dr Ziba Jiyane. The party - known as Sadeco - was formed in December last year after a split in the National Democratic Convention (Nadeco).
Sadeco secretary-general Sam Kennedy told Independent Newspapers from Durban that although the party was not represented in parliament, it was registered with the IEC and had a presence mainly in KZn but also in Gauteng and Mpumalanga.
"We are the owners of the name South African Democratic Congress," Kennedy said.
He said Sadeco supported multi-party democracy and had no interest in "creating any schisms or divisions" - but he said the new party's organisers "should come and engage with us. - Sapa