The Name Box shows the cell reference or the name of the active cell.
For a range, only the upper left cell reference is shown.
When a cell with a name is selected, like TotalSalesfor1998,
the Name Box looks like:
Having named cells and ranges is handy for navigating large worksheets. Names are also useful in creating some kinds of formulas and logical tests.
A name must start with a letter or an underscore character and can include only letters, numbers, periods and underscore characters. No spaces are allowed in the names! A name cannot be the same as a cell reference.
(There would be no point to that anyway!)