old man, grampa
爺 centers on an elderly male figure, specifically an old man or grandfather. The given meanings are direct applications of that core idea.
爺 combines 父 (father) with 耶, which likely contributes the sound. The character originally referred to an elderly male relative, consistent with the father component.
The top 父 suggests a father figure, and the bottom 耶 looks like an old man with a cane. Together, 爺 is an old man or grandpa.
For ヤ, imagine an old man yelling 'Yah!' as he gets up from his chair: Yah -> ヤ, and the old man is 爺.
grandpa; granddad
old man
grandfather
grandfather
old man; old goat
grandpa; gramps
dirty old man; pervert; lecher
good-natured old man
Konaki Jijii (a ghost in Japanese folklore with the shape of a small old man and having a baby's cry)
G8 Hokkaido Toyako Summit; Hokkaido Toyako G8 summit
like an old man; doddering; wizened; frowzy; seedy
elderly handyman; elderly manservant
cunning old man
old man
old man; (old) geezer