The use of the word called “pizza” is found to be taken from Latin terminology. It was available in a text that is found in the town of Gaeta in Southern Italy. Though the actual reason for the introduction of the name pizza is not certain, there are some theories which explain the reason why pizza was called such. The first theory says that the word pizza was taken from an old German word known as pizzo. This word means mouthful. The word pizza was observed to be in use from 997 CE. According to this first theory, the word became popular in Italy during the middle of the 6th century CE. This word was considered to be brought to the Italy by the Lombards who were invading the country. This theory is supported by the Oxford Dictionary, though it was revealed that there was no strong evidence.

第二种理论认为pizza一词取自拉丁语pinsa，这是pinsere一词的另一种时态。这个词表示面团被压碎或压扁。第三种理论认为，pizzicare一词是从pizzicare一词演变而来的，它赋予了抓或捏的含义。这也意味着比萨饼可以从烤箱中快速被抓出来。pizzicare一词也起源于意大利语pizzo。第四种理论认为pizza一词起源于拉丁语picea。这个词解释了烤箱中的面包变黑以及烤箱底部聚集的黑灰。

第五种理论认为比萨饼与pita一词有关。人们发现，这个词出现在亚拉姆语中，实际上是面包的意思。这种面包存在于几个扁平的层中，看起来与pita面包相似。披萨被希腊人称为pita，意思是馅饼，土耳其语称为pide，阿尔巴尼亚语称为pite，塞尔维亚语和克罗地亚语称为pita，现代希伯来语和保加利亚语称为pita。现在很受欢迎的比萨饼起源于意大利，意大利被认为是一种有番茄馅的那不勒斯馅饼。奶酪的添加是在1889年。这就是为什么比萨饼被称为比萨饼的简史