Why is the name of Poland the only name in that country that is normal?

My grandpa Kierylo came over from Tarasowka which is in poland.But my question is ,why does that country have such a normal name compared to the bizarre names of their towns and cities there?It is surrounded by strangely named countries like,Czech,Slovakia,ukraine,etc.Also if there is alot of Polish people in the USA,then how come no one can pronounce Polish names?,And how much harder is Polish to learn,than say Spanish?