Thanks for the pronunciation assistance. It has to do with Semitic language branches going back to Ugaritic hw and hy (Northwest Semitic) and so the variations in the Semitic language spellings have to do with branches within the Semitic languages. See Edward Lipiński, Semitic Languages: Outline of a Comparative Grammar (2nd edition; Peeters, 2001), p. 306 "Independent Personal Pronouns." It's easy to not see connections between the Semitic languages unless you know what to look for. For instance, distinctions between Semitic languages such as Aramaic עלע and Hebrew צלע are explicable through consonant changes from proto-Semitic. There are a zillion examples: Aramaic מדבחא & Hebrew מזבח. Hebrew ילד // Arabic walad. Both pronunciation and consonant changes disguise the interrelationship among Semitic languages.