Goq: I totally agree with you that referring to R’ Schlanger as “schlanger would be horribly disrespectful. It is my belief, however, that institutions often develop names of their own. In this case the yeshiva has developed the name Schlangers. When people say Schlangers they mean to say the yeshiva known as Schlangers, Not R’ Schlangers yeshiva.
On a side note. does it bother you that many tannaim, amoraim, rishonim, etc. are referred to by their first names?