1. Wikipedia states: "according to a notice in Nature at the time, it was named in honour of Pierre Curie, but was considered at least by some to be in honour of Marie Curie as well."
2. The Curie isn't an SI unit, the Becquerel (Bq) is.
Time to change that, then. She insisted on using both surnames and strongly emphasized her Polish roots throughout her life. Erasing her Polish maiden name clashes with her wishes and is only possible, because due to historical circumstances Poland had very limited impact on global popular culture.
>strongly emphasized her Polish roots throughout her life
and named the first element she discovered - Polonium - after her homeland.
And in Russian space she is Мария Склодовская-Кюри (Maria Skłodowska-Curie) too (that was on her portrait in our chemistry class back in 198x for example).
2. The Curie isn't an SI unit, the Becquerel (Bq) is.