In the phonetic alphabet Papa represents the letter. My dictionary defines ‘papa’ as a noun, meaning father, from the Old French.
I never called my dad “papa” (it has a rather pretentious ring to it unless you have an accent, imo) but I’ll share a couple of things about my dad, who is sadly no longer with me.
He loved cats and would talk like a baby to them, which, being a 6’4” guy often looked – and sounded – ridiculously silly but also rather endearing.
He read voraciously and annoyed the hell out of me by always reading the last page first.
He found sublime joy in walking along a warm beach collecting shells.