As Pete has noted, it's not generally a good idea to use the "real name"
field for inband data such as membership number, etc.  If you're using
the DBMS features in 1.8d it is better to maintain this information in
separate fields in your database.  But you have to do that yourself,
LISTSERV can't populate those fields for you.  Generally this is done
either with a CGI that gathers the information from the web, or by
merging data from a pre-existing table.

Note that there is really only one field, what we usually call the
"Real Name" field, rather than two fields called FirstName and LastName.
The syntax of the SUBscribe command simply requires that you provide
at least two discrete words for that field, of which (as Pete has implied)
one or both can be "*" (or you can use the ANONYMOUS option).

Nathan