Who many ways are there to spell eilidh?

There are actually a few different ways to spell Eilidh, though the most common is the one you've provided: Eilidh.

Here are some others you might come across:

* Ailidh

* Ealasaid

* Eilif (This one is more common in Scottish Gaelic, but it can sometimes be used in English)

It's important to remember that the spelling might vary depending on the person's preference and the specific dialect they are using.