My grandfather ז”ל (the Frankfurt connection) was a chazzan for much of his professional career. When he died several years back, I inherited his sifrei chazzanus and his cantorial levush (clothing). I have since noticed that often, especially in some of his older post-war seforim, the title of chazzan (abbreviated Ch. or CH.) is found between the personal and family names, similar (lehavdil) to the title of Cardinal in the Catholic world.
Why is the title of Chazzan positioned there in most written contexts from that time?