Is there any term for the habit of playing around with words, or even names, and nickname them? Like 'No' becoming 'nopes', 'whatever' becoming 'tevs', milky-wilky etc. This happens a lot with cricket teams, who keep nicknaming people - Wilkinson becomes Willy or Wilks, Hogg becomes Hoggy (though it's longer).
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'Nicknaming' specifically for names.
Other words you can use: 'abbreviation' or 'to abbreviate' and 'dimimutive'