Randomly Assigning Names to Items

by Allen Wyatt
(last updated November 3, 2018)

Gary has two lists in a worksheet. One of them, in column A, contains a list of surplus items in our company and the other, in column G, contains a list of names. There is nothing in columns B:F. Gary would like to assign names, randomly, to the list of items. Each name from column G should be assigned only once. If there are more names than items, then some names won't get used. If there are fewer names than items, then some items won't have associated names.

There are a couple of ways that this can be done. Perhaps the easiest, though, is to simply assign a random number to each item in column A. Assuming that the first item is in cell A1, put the following in cell B1:

=RAND()

Double-click the fill handle in cell B1, and you should end up with a random number (between 0 and 1) to the right of each item in column A.

Now, select all the cells in column B and press Ctrl+C to copy them to the Clipboard. Use Paste Special to paste values right back into those cells in column B. (This converts the cells from formulas to actual static values.)

Sort columns A and B in ascending order based on the values in column B. If you look across the rows, you'll now have items (column A) associated randomly with a name (column G).

Even though it is not necessary, you could also follow these same steps to add a random number to the right of each name and then sort the names. (I say it isn't necessary because randomizing the items should be enough to assure that there are random items associated with each name.)

The technique discussed so far works great if you have to do the random pairing only once in a while. If you need to do it quite often, then a macro may be a better approach. There are, of course, many different macro-based approaches you could use. The following approach assumes the item list is in column A and the name list in column G. It also assumes that there are header cells in row 1 for each column.

Sub AssignNames()
    Set srItems = Range("A2").CurrentRegion
    Set srNames = Range("G2").CurrentRegion
    NameCount = srItems.Rows.Count - 1
    ItemCount = srNames.Rows.Count - 1

    'Randomize Names
    ReDim tempArray(NameCount, 2)
    For x = 0 To NameCount - 1
        tempArray(x, 0) = Range("G2").Offset(x, 0)
        tempArray(x, 1) = Rnd()
    Next x

    'Bubble Sort
    For i = 0 To NameCount - 2
        For j = i To NameCount - 1
            If tempArray(i, 1) > tempArray(j, 1) Then
                tempItem = tempArray(j, 0)
                tempName = tempArray(j, 1)
                tempArray(j, 0) = tempArray(i, 0)
                tempArray(j, 1) = tempArray(i, 1)
                tempArray(i, 0) = tempItem
                tempArray(i, 1) = tempName
            End If
        Next j
    Next i

    'AssignNames
    Range("B2") = "Assigned"
    AssignCount = NameCount
    If NameCount > ItemCount Then AssignCount = ItemCount
        For x = 0 To AssignCount
        Range("B2").Offset(x, 0) = tempArray(x, 0)
    Next x
End Sub

If there are more names than items the macro randomly assigns names to items. If there are more items than names it randomly assigns some items to names and randomly leaves "holes" (items without names). It stores them in column B, overwriting whatever was there.

Note:

If you would like to know how to use the macros described on this page (or on any other page on the ExcelTips sites), I've prepared a special page that includes helpful information. Click here to open that special page in a new browser tab.

ExcelTips is your source for cost-effective Microsoft Excel training. This tip (5682) applies to Microsoft Excel 2007, 2010, 2013, 2016, 2019, and Excel in Office 365.

Author Bio

Allen Wyatt

With more than 50 non-fiction books and numerous magazine articles to his credit, Allen Wyatt is an internationally recognized author. He is president of Sharon Parq Associates, a computer and publishing services company. ...

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