Party members are widely expected to back the scrapping of the National Front name for Rassemblement National ( Union, or Rally) at a congress in Lyon, southeast France.
"The National Front has become adult... its nature has changed. It has gone from a party first of protest in its youth, then an opposition party to a party of government," Le Pen told French television after announcing the rebrand plan in March.
She is hoping to draw voters who back her conservative, anti-immigrant and eurosceptic agenda but who might have been turned off by the more incendiary views of her father, party founder Jean-Marie Le Pen.
"That has always been the party's dilemma: try to attract the classic right while at the same time keeping the symbol of a National Front that hasn't yet gone away," Valerie Igounet, a historian specialising in the far right, told AFP.
"Party activists might reject (Jean-Marie's) more controversial comments, but many of them admire him for what he's built," she said.
Marine had already kept the Le Pen name off her campaign posters last year, and even her niece Marion Marechal, seen as a rising rightwing star, has stopped using the Le Pen name.
In a nod to the 48 percent of members who opposed a rebranding in a survey last year, the party kept its distinctive flame logo -- which Jean-Marie borrowed from the neo-fascist Italian Social Movement, one of his main inspirations.
He was eventually kicked out by his daughter over his repeated anti-Semitic comments, part of her efforts to portray the party as a mainstream and viable governing force.
Yet Le Pen has struggled to regain her footing since a stinging defeat by Emmanuel Macron last year, despite winning 34 percent of the vote -- a record for her party.
She has faced financing problems as well as criminal charges for tweeting pictures of Islamic State atrocities and over the alleged misuse of European Parliament expense funds.
More recently she has been trying to win over leaders of other rightwing groupings ahead of European Parliament elections next year, so far without success.
Even some party lawmakers have abandoned her, including MEP Bernard Monot, who quit Thursday criticising the focus on only "security, the fight against terrorism and immigration".
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