When you import contacts, keep in mind that a contact can be an organization or an individual.
If it's an organization, you can import into
- Organization Name
- Organization Contact Person
If it's an individual, you can import into:
- Title
- First Name
- Middle Name
- Last Name
- Suffix
- Spouse Title
- Spouse First Name
- Spouse Middle Name
- Spouse Last Name
You can't import into both the organization name fields and the individual name fields.