The Zeiss Ikon is NOT a Cosina camera. It is built by Cosina. It does not use the Cosina body. It does not use the Cosina rangefinder components. It is not made on the same line as Cosina's Voigtlander bodies.
It is a German camera made in Japan. Are Toyotas, Hondas and Nissans built in the U.S. considered American autos? Definitely not. They are considered Japanese cars. Same with the Zeiss Ikon.
The late history of Zeiss Ikon is a bit convoluted when taken into consideration the roles of Voigtlander and to some degree Rollei.
Carl Zeiss did make a plate camera more than 100 years ago, and the Werra rangefinder was a Carl Zeiss Jena product. However, much depends on whether Carl Zeiss Jena is to be considered a branch of Carl Zeiss or an unrelated entity. Certainly, when East Germany fell, Carl Zeiss Jena rejoined Carl Zeiss AG.
Final assembly of some Contarex bodies was completed by Carl Zeiss after the demise of Zeiss Ikon and are marked "Carl Zeiss" (and command a premium on the collectors' market). But these had begun life as Zeiss Ikon products and not Carl Zeiss.
So, you could argue that the Werra and Zeiss Ikon are the only two modern-day Carl Zeiss-designed bodies.