Vietnamese uses the O with tilde charcater Õ, it's fairly common. The first word I can think of is ngõ https://en.wiktionary.org/wiki/ng%C3%B5_h%E1%BA%BBm htt

Vietnamese uses the O with tilde charcater Õ, it's fairly common. The first word I can think of is ngõ https://en.wiktionary.org/wiki/ng%C3%B5_h%E1%BA%BBm https://en.wiktionary.org/wiki/ng%C3%B5_h%E1%BA%BBm