However, you could consider these options:
* Karlie (pronounced "kar-lee"): This is the most straightforward option, as it's easy to pronounce and spell in French.
* Carly: This is a common English name that is also frequently used in French.
* Charlie: This is another option, especially if you want a slightly more masculine-sounding name.
Ultimately, the best way to write "Karlie" in French is to choose the option that you think sounds best and best reflects the name's meaning or significance to you.