The issue highlights some of the deep distrust among Myanmar's patchwork of minorities towards the Bamar ethnic majority from which Suu Kyi and most of the political establishment hail.
Thousands hit the streets of eastern Mon State on Sunday, the biggest rally yet against plans to rename the local Thanlwin bridge spanning the wide Salween River.
Lawmakers from Suu Kyi's National League for Democracy (NLD) party have proposed calling it the Bogyoke Aung San bridge.
Many of those protesting on Sunday said locals felt their wishes to keep the old name were being ignored.
"The NLD is powerful in the parliament and nowadays they can do whatever proposal as they like," demonstrator Lin Htet, 34, told AFP.
"But for us and for all ethnic people, we value many things in our culture and they should listen what the local ethnics want."
Saw Kyaw Moe, who hails from the nearby Karen ethnic group, was part of a contingent of protesters who joined in support of the Mon.
"The MPs should listen to the wishes of the people who appointed them as MPs but now they don't listen the voices of the people," he said.
The fight over the bridge's name is seen as more than just a symbolic designation, but part of a larger fight for ethnic self-determination.
Suu Kyi's father Aung San is regarded as a national hero, especially among the Bamar majority.
But many ethnic groups see him as a more controversial figure who failed to deliver on promises of greater autonomy and federalism for them.
Since winning a landslide election victory in late 2015 Suu Kyi has made it a flagship policy to find a lasting peace.
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