What's in a Nickname?

Modern American English has a pretty regular system for making nicknames (the fancy word is hypocoristics)--take the main phoneme/syllable (or at least a prominent one) and add "ee" or "a", or just leave it as is. Ex: Jackson-->Jack or Jax; Eleanor-->Ella; Madison-->Maddy. Foreign, or even archaic English, nicknames thus can seem pretty strange or unintuitive to modern American ears, but they sure can be fun!

• Arabic: take the root consonants (3, sometimes 4), and follow this pattern--first consonant/A/second consonant/second consonant (or 3rd, if 4)/U or O/U/final consonant. 
• Barak --> Barruuk, Maryam --> Maryuum
• archaic English: adding '-kin' or rhyming (or both!).  
• Robert --> Robin. Rick --> Dick. John --> Jankin --> Hankin --> Hank.
• Australian English: adding '-az' or 'azza' if a prominent central/end R is present; add '-o' or 'ooey' to any other name. 
• Caroline --> Caz, Cazza. Daniel --> Danno. Moses --> Moey.
• older French: adding '-ot' for male; '-ette' or '-ine' for female. 
• Pierre --> Pierrot. Jeanne --> Jeannette. Amanda --> Amandine.
• even older French: adding '-on'.  
• Alice --> Alison.
• Hindi: adding '-u'.  
• Anita --> Nitu.
• Italian: adding '-ino', '-etto', or '-ello' for male; '-ina', '-etta', or '-ella' for female.  
• Cesar --> Cesarino. Clara --> Claretta. Fiore --> Fiorella.
• Japanese: simply dropping a syllable, and/or adding '-chan' for either sex, or sometimes '-ko' for females.
• Koyomi --> Yomi. Kyou --> Kyou-chan. Usagi --> Usako.
• Russian: adding '-ka', '-sha' or '-ya'. 
• Ekaterina --> Katenka. Mikhail --> Misha. Tatiana --> Tanya. 
• Scottish: adding '-an', '-agan' or '-aidh' for male; '-ag' for female. 
• Angus -->Angaidh. Dubh -->Dubhagan. Bran --> Branan. Anne --> Annag.