"Bangla" is our mother language, we speak in "Bangla" and "Bengali" is who we are, the people. I hope this clears the confusion.
Thank you for your input, DS. This brings some light about this subject, with which I am not accustomed (perhaps similar to other users as well). So okay, I understand that the term "Banlga" is the correct one (and this is the one stated in OP as well). But we also need to know if the ticker "[BEN]" is correct or if we should use "[BAN]".
Perhaps you or Learn Bitcoin can clear this as well? Thank you in advance.