How about:
Function GetLastRow(strSheet, strColumn) As Long
Dim MyRange As Range
Set MyRange = Worksheets(strSheet).Range(strColumn & "1")
GetLastRow = Cells(Rows.Count, MyRange.Column).End(xlUp).Row
End Function
Regarding a comment, this will return the row number of the last cell even when only a single cell in the last row has data:
Cells.Find("*", SearchOrder:=xlByRows, SearchDirection:=xlPrevious).Row
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