I sometimes hear words like "Willam" or "Wilkinson" pronounced like /'wəl-jəm/ or /'wəɫ̩-kən-sən/, rather than /'wɪɫ̩-jəm/ or /'wɪɫ̩-kən-sən/. In other words, the /wɪɫ̩/ cluster is sometimes swapped with /wəl/. It seems to me like the former word William is especially affected by such coarticulation(?) when it's following or followed by another word, say Sherwin-Williams or William Shakespeare in a bit rapid speech.
Am I just getting it wrong as a non-native speaker? Or is there any phonological/linguistic background on this?