What was Marie Curie's original Polish first name?

Marie Curie’s original Polish first name was Maria. Her birth name was Maria Salomea Skłodowska, and she later became widely known in France as Marie Curie.

She was born in Warsaw in 1867, when Poland was under foreign rule following the partitions of the Polish–Lithuanian Commonwealth. After moving to Paris to study at the Sorbonne, she used the French form “Marie” of her first name. Her surname Curie came through her marriage to physicist Pierre Curie.

Curie continued to preserve her Polish identity throughout her life. She named the element polonium after Poland, taught her daughters Polish, and maintained strong connections with the country. Her full Polish-born name is therefore more accurately given as Maria Salomea Skłodowska.

The answer is not “Marie” because that is the French form she adopted professionally. The question asks for her original Polish first name, making Maria the canonical answer.