My grandson calls me Arrow. He can’t yet make a “gr” sound, and his early attempts to say “Grandad” sounded like “Ah-woah”.
His other Grandad Karel (Karl) is Czech. The Czech word for Grandad is Děda, which to an English-speaker sounds like Jedda.
So our grandson calls his two grandfathers Arrow and Jedda, which makes us sound like a couple of retired superheroes.
I quite like it