Using Calc, russian version. When I create new list - it's name is "Insert2", "Insert3" etc. ("Вставить2", "Вставить3" and so on)
When I wrote list, I've meant sheet (in russian it's the same word, лист)
This is customizable, take a look at Options > Calc > Defaults
According to comment #2, closing as NotABug. Please, feel free to reopen if you disagree. Best regards. JBF