John Lapsley along with William Lapsley are witness’s at Patrick Darby and Mary McDonnell’s wedding. I don’t know much about either of them but have found several possible suspects:
CHURCH BAPTISM RECORDS for JOHN LAPSLEY
1821 born in Laois
Father: William Lapsley.  Mother: Mary
1824 born in Laois
Father: John Lapsley.  Mother: Cath (Holland)
1828 born in Laois
Father: James Lapsley.  Mother: Bid (Bridget) Delaney
1834 born in Laois
Father Patrick Lapsley.  Mother: Mary Carroll
1855 born in Donegal
Father:  Edward Lapsley    Mother: Jane
1858 born in Laois
Father: John Lapsley     Mother: Bridget Ryan
1860 born in Kilkenny
Father: Patrick Lapsley     Mother: Mary Walsh
CHURCH MARRIAGE RECORDS
1830 John Lapsley and Catherine White