It's a fairish bet that Ivorwen probably died young; she isn't heard of again, and the Wild is still the Wild, as JRR said.
A good password, indeed.
I'll have another one up shortly.
I also came across (I think) Irisse for Aredhel, but the counsel bit didn't apply, so I kept looking.
Oh, and one of the Old Took's I-initial sons died young. Isengrim, I think.