[ekianjo]

Her signature was apparently more often than not M. Curie.

https://cs.wikipedia.org/wiki/Soubor:Marie_Curie_signature.s...

The nobel prize of 1903 refers to her as "Marie Curie, née Sklodowska", meaning that Sklodowska is her maid name but not her name after marriage in French.

https://www.nobelprize.org/prizes/physics/1903/summary/

[DoreenMichele]

Yes, it means it's her maiden name, but née just translates as born. It was her birth name.

[ekianjo]

Yeah, and it's typically how it is said in French: it refers to your name at birth, which is not current anymore.