The splinter group's new political party will likely be known as the South African Democratic Congress, the SABC reported on Sunday.
The party will be named and registered on Monday, it said.
A decision to oppose the ANC in next year's election was taken at the national convention in Sandton on Saturday.
The party will be formally constituted in Bloemfontein on 16 December, but co-leader Mbhazima Shilowa told delegates at the closing session of the convention that it could not be a "no-brand name" until then.
On the eve of the convention, the ANC launched a bid in the Pretoria High Court for an interdict against the use of what seemed the most likely name, the SA National Congress, as well as the SA National Convention.
The ANC said it was protecting its "trademark, name and identity".
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Sapa