Correct spelling for the English word "Kathileen" is [kˈaθɪlˌiːn], [kˈaθɪlˌiːn], [k_ˈa_θ_ɪ_l_ˌiː_n] (IPA phonetic alphabet).
The etymology of the name "Kathileen" is a combination of two names: "Kathleen" and "Eileen".
"Kathleen" is derived from the Irish name "Caitlín", which is the Irish form of the name "Catherine". The name "Catherine" has Greek origins, derived from the word "katharos", which means "pure" or "clean". It became a popular name in Ireland due to the influence of Saint Catherine of Alexandria.
"Eileen" is an Anglicized form of the Irish name "Eibhlín", which is a variant of "Aibhilín". The name "Aibhilín" is derived from the Norman French name "Aveline", itself derived from the Germanic name "Avelina".