What does quiche means in french?

"Quiche" in French is actually not a word with a direct translation. It's a loanword from German, originally "Kuchen" meaning "cake".

However, over time, it evolved to specifically refer to the savory tart dish we know as "quiche" today.

So, while there's no perfect French equivalent, you could say "une tarte salée" (a savory tart) or "une quiche lorraine" (a Lorraine quiche) to describe it.