Easy one. The name you would call them would be " Lucky" Simply because Blackjack is about luck and a bit of skill so i call them Lucky XD
Blackjack is the nickname for the hole cards Ace Jack. (AJ)
Blackjack.
bill
Izzy is usually a nickname for Isabel, a good nickname for Lauren is Lau (pronounced Law) but a nickname is there for a reason, it doesn't have to match the birth name, just has to suit the person.
Dude.
The classic name for a reader is 'Bookworm'.
Nicknames depend on your relationship with the person and their attributes.
I like Ike for an older person or Ikey for a baby.
It means you're good at Blackjack
There are lots of Blackjack variations, including Power Attack Blackjack, Double Blackjack, Multi-Hand Blackjack and 21+3 Blackjack.
If you like 'Nan' as a nickname, then yes, it is a good nickname.
In my honest opinion, no. But a monkey is a good nickname if the person has some or even few of the common characteristics of a monkey. But if you like being called by the nickname monkey, then there's nothing wrong about it...