Languages of Tyria
The "common" verbal language does not appear to have an official name. Nevertheless, it is spoken in various different dialects by the majority of all sentient races throughout Tyria, and as such, allowed people of different nations, cultures, and races to effectively communicate with each other, even if their written language systems (if any existed) were different from each other. It seems to be of human origin, but it has become so widespread that basically every sentient race and creature has at least some ability in common language.
 New Krytan
New Krytan is the standard writing system used in Tyria. It was formed to act as a way to aid in sharing knowledge and communication between the various races. It is a hybrid of the Ascalonian and Old Krytan writing styles and was created in 1105 AE by the Durmand Priory. Villem Caraga of the Priory wrote about the creation of this system in Cultural Diffusion in Contemporary Kryta.
"Bookah" is a large, loud, bellowing, and dumb imaginary creature that the Asura used to frighten their children. Since their surfacing, they use the term to refer to those they view as inferior beings, which to them is almost everyone who is not an Asura. Bookah is also one of the few known words of the old spoken Asuran language known to outsiders.
The charr have their own language, but have shown knowledge of common language long before the truce between Kryta and the High Legions. Communication problems might have played a part in the past between human-charr animosity. Instead of a written language, the charr have used ideograms to communicate battle orders and similiar information, though their use was not widespread during the rule of Flame Legion's shaman caste.
The norn also have their own language, once found written in sign posts of the Far Shiverpeaks. Similiar to charr, they have had knowledge of the common language at least a hundred years before the rise of the Elder Dragon Jormag, which forced them to flee from their northern homeland.