Rabbi Asher ben Yeḥiel, is usually called "Rabbeinu Asher" or "The רא"ש" (pronounced by most Israelis as "Rosh"; often in North America it is pronounced like the English word "rush"*). However, today I've stumbled across two unsourced internet references to him that call him "Asheri". How widely used is this nickname, and are there any others?
Also: How is the nickname "Asheri" used? Does it stand alone, or is it "Rav Asheri" or "HaAsheri" ("The Asheri"), or some other formulation?
*Not to be confused with Rabbi Shimshon, aka the ר"ש, whose name is often pronounced similarly.