You can define your own name like:
[Volume (LY) 2014],
(ooxml, embedded labels, table is Sheet1);
The the following table will be referred as MySampleTableName.
But why is the name correct, if i load this tables? This table is from the tutorial https://help.qlik.com/sense/1.1/de-DE/tutorials/Tutorial%20%E2%80%93%20Erstellen%20einer%20App.zip
I can´t find differences to my tables.