No universo, a língua Klingon é uma que evoluiu naturalmente no mundo natal dos Klingons;
Existem várias contas no Enterprise e no TNG de " antigo Klingon " e " Klingon medieval ", sugerindo uma tradição lingüística que remonta a dezenas de milhares de anos e que pré-datam a história gravada e escrita ...
TARQUIN: Have you had a chance to look at the book I gave you?
[...]
TARQUIN: What did you think of it?
HOSHI: It's an interesting language, reminds me of medieval Klingon.
Mark Okrand, o criador da língua Klingon, ofereceu uma história em vaso da evolução da (agora unificada) língua única em sua Klingon para o viajante galáctico :
"The current linguistic situation in the Klingon Empire is a rather complex one that can be somewhat better understood in the light of a bit of history. Klingon mythology holds that over 1,500 years ago, Kahless the Unforgettable actually created the Klingon Empire by overthrowing the tyrant Molor. [...] Before Kahless united them, however, the peoples of Kronos, the Klingon Homeworld, consisted of disparate groups [...], with different customs and sometimes different languages. As the Empire expanded, as other planets were [...] conquered or incorporated, an even greater number of distinct cultures and languages became part of the overall mix"
"In terms of language, there are regions within the Empire where the ancestral languages are still spoken, though in a somewhat changed form. In short, within the Empire there are several languages, and the major languages (that is, those with the most speakers) are spoken in a number of versions or dialects.
The official language of the Klingon Empire, the language used for all official purposes, descended from that spoken by Kahless (and, for that matter, also by Molor)."
(edited for brevity and clarity)