Today's guest namer is my six-year-old daughter, who spent a recent morning hard at work planning a fantasy novel about "centrises." A centris, she explained, is half woman and half pegasus. When I checked in with her she was developing a complete chart of the centris population, with columns for "name," "spirit," "parent" and "leader." For example: Name: Fironnah (pronounced fye-RAHN-a) Spirit: Fire Parent: Liyliah (LYE-lee-ah) Leader: Niara (nee-AH-ra) Our young author gave her permission f