beag
Some Irish are small and some are tall. It cannot be said to be one way or another. They are not the tallest in the world, but they are not the smallest either.
None , a small percentage have been of Irish descent but none have been fully Irish.
Shamrocks
It is a small bird. It has a red breast.
Yes, it means a small boy in Irish English (or at least in Dublinese). That -een suffix is propably not that productive these days and it means small.
A small group a Irish Business man. It was all a Scam. For 50 years.
Irish and American usage differ in the use of this word. In the U.S. usage the word "creek" can be "sruthán" (small stream, brook) or"gleanntán" (small glen, dell). In Irish usage crompán (creek; low-lying land beside creek/river) camas (small bay, cove) góilín (small inlet, creek)
A leprechaun is a small Irish creature that doesn't exist.
irish history
Beag (said like: byug).
A very small proportion of the population of Northern Ireland (Ulster) can speak Irish Gaelic.
Irish isn't a langauge. In Ireland they speak English and a little Irish Gaelic. So if you mean Irish Gaelic, then some probably would, but only a very small minority.