Granddad or Grand-dad or Grandad?
Which is the correct spelling?
Both exist, apparently.
The NOAD, says
granddad |ˈgranˌdad| (also grandad) noun informal - one's grandfather.
grandad |ˈgranˌdad|, Noun - variant spelling of granddad .
The OALD says the same thing, and is more specific, saying that "Granddad" is North-American English.
If someone from U.S./UK can confirm, it would add more info.
Further documentary evidence.
Clive Dunn's only #1 hit record, the famously ironic post punk single – Grandad, was spelled with one 'd'
In the UK, I've generally seen 'Grandad' used, particularly among the older generations containing a preponderance of grandads. So I'd say that's the correct spelling in British English, and from the other answers 'Granddad' appears to be more common is US English.
Searching Irish websites using Google:
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