pizza 为食品名，Pisa 为城市名， 二者在词源上无直接关联，没有必要将食品 pizza 的中文名与城市 Pisa 的中文名捆绑在一起。
美国《韦氏英语词典》：
pizza noun piz·za \ˈpēt-sə\
Simple Definition of pizza: a food made from flat, usually round bread that is topped with usually tomato sauce and cheese and often with meat or vegetables
Full Definition of pizza: a dish made typically of flattened bread dough spread with a savory mixture usually including tomatoes and cheese and often other toppings and baked —called also pizza pie
Examples of pizza
We ordered a pizza for supper.
I ordered pizza for supper.
a slice of pepperoni pizza
Origin of pizza
Italian, perhaps of Germanic origin; akin to Old High German bizzo, pizzo bite, bit, bīzan to bite — more at bite
First Known Use: 1845
《不列颠百科全书》：
Pisa (Italy)
Pisa, city, central Italy, in the Toscana (Tuscany) regione. The city lies on the alluvial plain of the Arno River, about 6 miles (10 km) from the Ligurian Sea and 50 miles (80 km) west of Florence. Pisa lay by the sea until the 15th century...
