My ancestor William Kirby married Euphemia Talbot in Dublin in 1823. They had 3 sons born in ireland, not sure where, Edward c 1825,, John c 1826 and Thomas c 1831. Then the family moved to England where 2 daughters were born. William Kirby had a sister Emily b c 1804 Ireland living with the family in 1841 and 1851 censuses in England. In 1841 they were in Birkenhead, Cheshire and from 1851 in Liverpool. William disappeared after 1851 census. Don't know where he went. Have investigated deaths between 1851-1861 but none seem to fit. Perhaps he was the marriage witness in 1863? Son John never married. Edward married imaybe n Ireland. He was back in Liverpool by 1861 with a wife and 10y old daughter both born in ireland.
Sons John and Edward died young in 1861 and 1863. Thomas married in Liverpool and stayed there. Charlotte married a woollen manufacturer from Kendal, Westmorland and Alicia, my great great grandmother married a ships captain Charles Phillips Newman from the Isles of Scilly and travelled around the world with him.
The first Kirby to migrate to Australia, where I live, was my paternal grandfather in 1919, son of Alicia Kirby's daughter Emily Kirby Newman. If you're confused about his name I'm not surprised. My grandfather was born Cyril Karl Schulz (father German) but changed his name to various things, including Cyril Terence Charles Kirby.
In all this I have never known where in ireland they came from. Like you, I found the nmarriage only in a newspaper notice transcribed from the Connacht Journal:
June 12 1823 Connaught Journal, published Galway, Ireland, Thursday, June 12, 1823
MARRIAGES On the 2d instant, William KIRBY, Esq to Euphemia, eldest daughter of Mr. TALBOT, of Lower Gardiner street (Dublin).
There are some common names in your tree. Maybe we are connected?