Calling a language “of the people” pops up often across different cultures. Quechua for example does the same; the native name of the language is “runa simi”, it’s basically “people’s language”.
And in the case of the Germanic languages it’s so common that it was likely already in Proto-Germanic, thus probably older than the christianisation of those tribes.
I’m not sure if it’s because of Christianity.
Calling a language “of the people” pops up often across different cultures. Quechua for example does the same; the native name of the language is “runa simi”, it’s basically “people’s language”.
And in the case of the Germanic languages it’s so common that it was likely already in Proto-Germanic, thus probably older than the christianisation of those tribes.