Lupin's middle name; Ron's wand

[Jenn Oramous]

No: HPFGUIDX 112358

Okay, I haven't been around for a while and there is NO way to catch up on
reading all of these posts....so if these questions have been asked and
answered, could you point me in their direction? If not, then.....

Does anyone know what the "J" stands for in Lipin's name? When the trio are
on the train in POA, Hermione states that he is "R J Lupin" because of his
luggage...so any ideas. 

And two when Ron gets his new wand it has a unicorn hair core...again. His
first wand had a unicorn hair, we know this because he mentions that it is
poking out in SS (btw if this wands was handed down to him, how did it
choose him? Wouldn't it have chosen the person who had it first?). So once
you have a wand do your replacement wands always have the same core? Could
this mean that certain ppl have certain traits or enhanced traits because of
the type of core in their wand? And do we know what cores Lily and James
had? And in reference to that extra question in there, could Ron be stuck
with a sub par wand because he was given a hand-me-down in the first place?
What I mean is maybe he was never meant to have unicorn hair but since that
used one was now he is stuck with it.

Okay I am going back to the shadows.....
Jenn