There are many a character in this show that are unrelated but share a name;

Charlotte Malkin - Charlotte Staples Lewis
Dave (from the ward) - David (Libby's dead hubby) - David Reyes (Hugo's dad) - Desmond's middle name is David - Sawyer once conned a man named David
Daniel Farraday - Daniel (the alter boy at Eko's church) - Danny Pickett (the other Juliet shot) - Danny (Anna L's ex)

...to name a few. I think the writers just enjoy toying and confusing us with similar names