Here are some options:
* "Nigel" - You could simply use the English spelling as it's widely understood.
* "Nijel" - A phonetic approximation of the name.
* "Nicolas" - This is a popular French name with a similar sound.
* "Noël" - If Nigel has a connection to Christmas, this could be a fitting option.
Ultimately, the best choice depends on the context and your personal preference.