Creating A Token

May be a dumb question, but I am trying to insert a token in an email as a salutation.  We have a "Dear" field in the Contact section of Dynamics that is populated with "Yomi First Name".  I see the field listed when I look at the synced fields in the admin section of Marketo.  However, when I try to insert it as a token into my emails, none of the "Contact" section fields from Dynamics are listed as options.  Any ideas as to how to either get that mapped properly or create the token I need?  I know that I can use the "First Name" token, however, the "Dear/Yomi First Name" field in CRM is the one we use to house the individual's more informal name.  IE:  "Ed" instead of the more formal "Edward".