Using An If Statement To Check If A Sheet Already Has A Name

so i have a list of names. the code i have is able to add new sheets to the workbook. but i need the code to be able to run and check all the other worksheets in the workbook to see if that person already has a worksheet. if he/she has a worksheet then End If and go on to the next name.

Sub AddSheetWithNameCheckIfExists()
Dim ws As Worksheet
Dim newSheetName As String
Dim row As Range
Dim x As Integer
Sheets("data").Select
Range("Agent_name").Select
ActiveCell.Offset(1, 0).Select
Range(ActiveCell, ActiveCell.End(xlDown)).Name = "employees"
x = 0
For Each cell In Range("employees")
For Each ws In ActiveWorkbook.Worksheets
newSheetName = ActiveCell.Offset(x, 0).............