What nicknames to give to grandparents?

In the past, we solemnly called our grandparents "grandma" and "grandpa". Times have changed!

• Granny, Gran, Nan, Grandad, Pops, or Grandpa: these little nicknames all refer to the same people who are our grandparents.
• With time and usage, the names have progressively diversified. The geographical origin and the habits of the family are also determining in the choice of nicknames.
• Even if the great classics Grandma and Granddad are still very popular, some grandparents choose variants that seem more modern.