KAYDEE ➠Kaydee's mom liked the name Katie, but she decided to spell it a little bit different. Kaydee's mom is named Haydee; so she thought why not replace the H with a K, to form Kaydee. Kaydee told me that her mom named her sister the same way. Kaydee's sister is named Saydee. So now you have Haydee, Kaydee and Saydee.