I just had a thought. Since this was a gift to Harry, shouldn't it be called "Harry Potter's penknife"? ---- Cubs Fan2007 (Talk) 21:46, 9 December 2008 (UTC)

I agree, but it's referred to as "Sirius's knife" twice in OotP, in chapters 32 and 34. Harry calls it this himself when he gets the idea to try out the penknife on the Love Chamber door after seeing Hermione's Alohomora spell fail:
"Sirius's knife!" said Harry. He pulled it out from inside his robes and slid it into the crack between the door and the wall.
If Harry thought of the knife as more of his own, rather than as Sirius's, he probably would've exclaimed "My knife!" instead. But, technically, it was Harry's knife, so I agree that there is a reason to rename the article as you've suggested. Starstuff (Owl me!) 22:06, 9 December 2008 (UTC)

I see both of your points and I would like to say that it should be "Sirius Black/Harry Potter's Penknife". Willow Potter is brilliant 16:38, April 15, 2012 (UTC)