Those Colonel Fitzwilliam's last name is Fitzwilliam - the same as Mr Darcy's first name. Colonel Fitzwilliam is the son of Darcy's uncle, the current Earl, who is the brother of Lady Catherine and Darcy's (dead) mother, Lady Anne. He does not stand to inherit the title and estate because he is a younger son; his eldest brother will be the next Earl.
Tomorrow we move on to real interaction among the parties, but before I go, I thought I'd mention the tidbit that I like so much from this chapter:
The room in which the ladies sat was backwards. Elizabeth at first had rather wondered that Charlotte should not prefer the dining parlour for common use; it was a better sized room, and had a pleasanter aspect; but she soon saw that her friend had an excellent reason for what she did, for Mr. Collins would undoubtedly have been much less in his own apartment, had they sat in one equally lively; and she gave Charlotte credit for the arrangement.Tomorrow: Chapter 31
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