When working with dates in Excel, you may need to determine the month name for a given date or for a range of dates. There are a few different ways that you can do this, and which method you use will depend on your specific needs.

If you only need to determine the month name for a single date, you can use the TEXT function. For example, if the date is in cell A1, you can use the following formula:

=TEXT(A1,"mmmm")

This will return the full month name (e.g. "January", "February", etc.) for the date in cell A1.

If you need to determine the month name for a range of dates, you can use either the TEXT function or the CHOOSE function. For example, if the dates are in cells A1:A5, you can use either of the following formulas:

=TEXT(A1:A5,"mmmm")  OR  =CHOOSE(MONTH(A1:A5),"January","February","March","April","May","June","July","August","September","October","November","December")

Both of these formulas will return an array of month names corresponding to the dates in cells A1:A5. The TEXT function will return the full month name, while the CHOOSE function will return the abbreviated month name (e.g. "Jan", "Feb", etc.).