Etymology of "Pensieve" (Was: JKR punning names )

[Kayla Pittillo]

No: HPFGUIDX 160837

 > Carol, thinking that Pensieve is one of JKR's more clever puns and
> hoping that we'll see some "sieved" or "sifted" thoughts and memories
> in Book 7

Geoff:
This could link with what I wrote in 160719 earlier today about the fact
that an old word in English for "sieve" is "riddle" and wondered if Tom 
might get linked in here somewhere; with Harry dropping in on his 
thoughts from time to time, this could be interesting.

Kayla:
So is this the reason when people are referring to something filled with
holes they say riddled?
Maybe that's why Tom's name is Riddle; because it's prophetic of how he has empty spaces in his being, and isn't "whole"