Was Meyer fluent in Yiddish? He probably learned as his mother tongue.

There are also not many people left who speak the language. While Yiddish was still used from Lithuania to Amsterdam in the nineteenth century, there are now only a few thousand speakers worldwide. Actually, only in strict orthodox Jewish circles in New York and Jerusalem is the language actively passed on to younger generations, because people think it is inappropriate to use Hebrew, which is after all the language of the Bible, as an everyday language. In the Netherlands and Antwerp, there is still a community of some size.