Also Romansh: Source: "Vornamen in der Schweiz. Prénoms en Suisse. I nomi in Svizzera. Prenoms in Svizra" (1993) published by the Association of Swiss registrars https://www.portraitarchiv.ch/portrait?page=112
Adalbert von Chamisso (January 30, 1781 – August 21, 1838), was a German poet and botanist.He was born Louis Charles Adélaïde de Chamissot at the château of Boncourt in Champagne, France, the ancestral seat of his family. Driven out by the French Revolution, his parents settled in Berlin, where in 1796 young Chamisso obtained the post of page-in-waiting to the queen, and in 1798 entered a Prussian infantry regiment as ensign.
Source: "Vornamen in der Schweiz. Prénoms en Suisse. I nomi in Svizzera. Prenoms in Svizra" (1993) published by the Association of Swiss registrars
https://www.portraitarchiv.ch/portrait?page=112