Currently we use both `AJAX` (11 times) and `Ajax` (22 times).
Wikipedia uses `Ajax`: https://en.wikipedia.org/wiki/Ajax_(programming)
Mozilla uses `Ajax`: https://developer.mozilla.org/en-US/docs/Web/Guide/AJAX

As `Ajax` is currently used the most and it's preferred by Wikipedia and
Mozilla, we can change all it's occurences to `Ajax`.