The Saenuri, or New Frontier, party was formed from a merger of several centre-right parties in 1997 and known as the Grand National Party until 2012.
Elections are due this year and a spokesman said: "We've decided to change the party name to the Liberal Korea Party with a promise to be born anew."
Party leaders will meet to approve the title on Monday, he added, when it will go into effect.
Park adopted the Saenuri name in 2012 as part of an attempt to reform and regain voter support ahead of that year's general elections, which the party won.
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But a swirling corruption scandal has since surrounded Park, with huge demonstrations demanding her resignation, and she was impeached by parliament last month.
The party initially favoured "Conservatives' Power Party" for a new title, as recommended by its acting leader In Myung-Jin.
But the moniker met with public ridicule in the light of the scandal, one online poster commenting: "You'd better call it Money Power Party."
Saenuri's parliamentary floor leader Chung Woo-Taek said there had been disputes over using the word "conservative".
"But as everyone knows we are conservative, we decided not to put the word in the party name," he said.
The various components of the Grand National Party and their predecessors ruled South Korea for decades during the country's dictatorship and afterwards, and following 10 years in opposition its candidates have won the country's last two presidential elections.
The country's Constitutional Court is currently deciding whether to uphold Park's impeachment. If it does so new elections must be held within 60 days.
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