The Surname has evolved from  Glauser  to  Clauser  to  Klauser over the years.
GLAUSER 1600's in Bern and Zurich, Switzerland per Julius Billeter,
Swiss genealogist, charts on LDS films.

CLAUSER, Johann Peter b.1729 Mickarstanik?, Phalz (per Professor Igor
Pleve) Reformed and Elsenz, Baden was Phalz in 1720, on LDS film 1189109
near Eppingen, Baden arrived in Dobrinka, Volga River 29 June
 Eva Elisabeth b.1728
 l. Johann Adam Clauser b.1758 or 61 Germany m Catharina Foss FOOS in
 2. Nicolaus  b.1763 Germany m Rosina MEININGER in Dobrinka.
 3. Christina b.1766 Dobrinka
 4. Sigmund   b.1767 d1836 Dobrinka (m Maria Sibilla MAIER) and was adopted
by Goliesen; as there is no G in Russian this became the Holstein family?
Book: "Swiss Immigrants Into the Kraich Valley after the Thirty Years
War (Schwizer Einwanderer In Den Kraichgau Nach Dem Dreizig Jaehrigen
Krieg) pub 1983 by Rhine Palatinate (Pfalz) historians. Eight Glauser
families of Bern & Zurich moved to Elsenz in 1665-85 & name changed to
Clauser. Elsenz was devasted by the 30 years war.
for further, contact ..
 Arliss G/C/Klauser Hoskins