Contacts imported from livemail are sent without Names, so look like junk

I imported my Livemail and now my emails are being sent without people’s Names, only their “Email Display As” field, which EM Client has just stuffed with their raw email address.  How can I change it to use a Name field ?  My emails are looking like junk to people who receive them.  I have many hundreds so manual edit is not practicable.