A jackdaw or a jack-of-all-trades; also used as a nickname or informal term for a jack (the tool or the playing card).
From 'jack' with the diminutive suffix '-o', common in informal English naming. 'Jack' itself comes from the medieval given name, later generalized to mean various tools and playing pieces.
The suffix '-o' is fascinating—it appears in 'bucko,' 'buckaroo,' and even Australian slang like 'arvo' (afternoon). Adding '-o' to words makes them feel friendlier and more casual, which is why it's so common in Irish and Australian English.
Complete word intelligence in one call. Free tier — 50 lookups/day.