Range Names usually (By Default) have Absolute Address assigned them;
That's why January is repeating on you.
HTH,
Jim

"headly" wrote:

Say you've got columns of data, January-December, and name each column with
the month; Now I autosum under January, replace the cell reference with the
named range, and drag the autofill handle through the December column.
Instead of adjusting with the correct named ranges for each month, I get
January in every cell. What am I missing? TIA.