Can someone guide me in the right direction? My company runs as a parent company for multiple other companies that we manage. I am creating custom modules for each of the child companies to organize clients respectively. I need the ability to assign lead and/or contact names to the custom modules. I added a look up field to Custom Module 1 (TP Clients) and edited the properties like so- Lead Contact>Lead Module>Lead Name and it provided exactly what I needed. Then I went to add this same option to Custom Module 2 (SC Clients) as a look up field and ran into the error "field label 'Lead Name' already exists". I then tried with a multi-select look up field and ran into the same error when I tried to add to the second module. Is there a way to correctly do this? 

To clarify, my need is to look up Lead Name to multiple custom modules. ex. John Smith and Jane Doe are both leads in the 'Leads' module.  John needs to be entered through a look up field in 'TP Clients' and Jane needs to be entered through a look up field in 'SC Clients' that functions identically to the look up field in 'TP Clients'