I'm wondering if any con- or natlang uses a <yh> digraph. Recently, when we were discussing English <wh>, I was struck (not for the first time) by how aesthetically pleasing I think <wh> is compared to <hw> -- but how awful <yh> or <jh> look compared to <hy> or <hj>. However, I just came across the name of Congolese politician Joachim Yhombi-Opango. Does anyone know if the <yh> in his name is a digraph, perhaps for /ç/ or /j_0/? I'm not even sure what language the name is from.