Option Explicit
Private Sub CommandButton1_Click()
On Error GoTo ErrSheet
Dim n&: n = Cells(Rows.Count, 1).End(3).Row: If n = 1 Then Exit Sub
Dim sh As Worksheet, T, v$, k As Byte, p%, i&
n = n - 1: T = [A2].Resize(n): ActiveCell.Select
p = Worksheets.Count: Application.ScreenUpdating = 0
For i = 1 To n
v = T(i, 1)
If v <> "" Then
k = 0: Set sh = Worksheets(v)
If k = 1 Then
Worksheets("EXEMPLE").Copy , Worksheets(p)
ActiveSheet.Name = v: p = p + 1
End If
End If
Next i
Worksheets("NOMS").Select
Exit Sub
'si la feuille existe déjà :
ErrSheet: k = 1: Resume Next
End Sub