His last name in Arabic is غصن, the first letter being غ or ghayn ... This sound has no equivalent in English. On an English keyboard you would approximate the

His last name in Arabic is غصن, the first letter being غ or ghayn ... This sound has no equivalent in English. On an English keyboard you would approximate the sound with a 3. So his name would be 3osn. (https://en.m.wikipedia.org/wiki/Arabic_chat_alphabet https://en.m.wikipedia.org/wiki/Arabic_chat_alphabet) Ultimately transliterations are probably the legacy of some ancestor who immigrated decades or a century ago from Lebanon to Europe or the Americas.