Also a side note: I'm kind of somewhat bad with nicknames, so I had to look up what are some good nicknames for the amiibo online.
The nicknames for the amiibo inklings are below this reply in this thread (Keep in mind that this list might get updated until I get all the Splatoon amiibo).
The Splatoon 1 Inkling Girl amiibo's nickname is Liz.
The Splatoon 1 Inkling Boy amiibo's nickname is Dan.
And the Splatoon 1 Inkling Squid amiibo's name is Will.
The Splatoon 1 Inkling Boy amiibo's nickname is Dan.
And the Splatoon 1 Inkling Squid amiibo's name is Will.