It's likely you're thinking of the Italian name "Lucrezia," which is the feminine form of "Lucretius." In Spanish, this name would be spelled "Lucrecía".
If you're looking for a Spanish word with a similar meaning or sound, you might consider:
* Lucía: A popular Spanish name meaning "light" or "shining."
* Lucila: A Spanish name derived from "Lucilla," meaning "light."
* Lucinda: A Spanish name meaning "light" or "shining."
It's important to note that these are just suggestions, and the best choice for you will depend on the context and your specific needs.