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By default, a Google Sheets chart will use the first row as the the name of the Series. But if you are selecting a range in the middle of the table (for example, rows 38-100), then you can't use the first row as the name. You have to uncheck Use row 38 as headers.
In that situation, how do you name / rename the Series?
Make sure your graph shows the legend. Then, double click on the legend symbol you want to add a name to and type your name in the "Text Label" box in the menu that appears.
Go to the Chart editor and change the value for 'X-axis' to select data from the header range.
