The spelling of "Kelseigh" is not considered a traditional or common spelling for the name "Kelsey." The pronunciation of "Kelseigh" is typically the same as "Kelsey," which is /ˈkɛlsi/ in IPA phonetic transcription. The addition of the "igh" at the end of the name is considered a variation or customization of the original spelling. It is important to note that customized spellings of names can often lead to frequent misspellings and pronunciation errors.
The name "Kelseigh" does not have a clear etymology as it is a modern variant of the name "Kelsey". "Kelsey" is an English surname that originated as a place name in Lincolnshire, England. It is believed to derive from the Old Norse personal name "Ketil", combined with the Old Norse word "ey", meaning island or low-lying land near water. Over time, "Kelsey" evolved into a popular given name. "Kelseigh" might have simply developed as a creative spelling variation or a phonetic modification of "Kelsey". However, as it is a relatively new name, it does not have a firmly established etymology.