Hi Courtney,
I think an Email Scripting Token might be the best way to accomplish this.
You could create an email scripting token at the very top folder where you would need it and then use the same token throughout wherever you need their name.
You might be able to use something similar to the following code to accomplish your goal:
#if (${lead.SalesRepID}=="0000000000001")
Aaron Anderson
#elseif (${lead.SalesRepID}=="0000000000002")
Betsy Beaver
#elseif (${lead.SalesRepID}=="0000000000003")
Carson Carter
#elseif (${lead.SalesRepID}=="0000000000004")
Debbie Dobson
#elseif (${lead.SalesRepID}=="0000000000005")
Eric Eames
#elseif (${lead.SalesRepID}=="0000000000006")
Frank Ferguson
#elseif (${lead.SalesRepID}=="0000000000007")
George Gunter
#elseif (${lead.SalesRepID}=="0000000000008")
Henry Horton
#elseif (${lead.SalesRepID}=="0000000000009")
Isaac Inman
#elseif (${lead.SalesRepID}=="0000000000010")
James Johnson
#elseif (${lead.SalesRepID}=="0000000000011")
Kellie Krane
#elseif (${lead.SalesRepID}=="0000000000012")
Lisa Lane
#elseif (${lead.SalesRepID}=="0000000000013")
Matt Moser
#elseif (${lead.SalesRepID}=="0000000000014")
Neil Northington
#elseif (${lead.SalesRepID}=="0000000000015")
Opie O'Malley
#elseif (${lead.SalesRepID}=="0000000000016")
Your Sales Team
#end
(You should just have to paste it into the email scripting window!)