questions and random thoughts.........and a spoiler.

1)can anyone help me with the tweet nic-names used by the characters in this
show? "Doctor" and "Peach" are OK, "Nakaji" seems just to be a shortened
version of Nakajima ? SO- how can "Haru" and "Linda" be translated ?
.
2)Doesn't it seem odd that as close as these characters become, at some point
they would start using their REAL names when with each other instead of the
nic names they picked out for themselves ?
.
3)I give this drama extra points for NOT exploiting the plot device
of Nakaji and Haru's Mom and Dad knowing each other and having had a affair
many years ago--any other show and that would have been a "shocking" moment
at the end of a episode.