My great grandmother Ellen Tiernan born in 1854 came during the famine from County Leitrim . Parish is listed as Gortletteragh
At her wedding to Maurice Kirwin her parents are listed as Rosa Ward and Barney Tiernan
Unsure if they came with her.
A Charles Tiernan was at the baptism of one o her children
The subscription site Roots Ireland has a December 24 1850 baptismal record in Gortletteragh for a Ellen Tiernan with father Bernard Tiernan and mother Rose Wall.
I checked the parish register and it did list Wall.
There was also a Mary Tiernan baptized to the same parents on October 1 1848.
The Gortletteragh baptismal records have a gap between 1840-1848.
There is a Bernard Tiernan who died in 1864. He lived in Derreen townland Mohill civil parish. Not sure if this is your Bernard. Age 72.
Roger McDonnell
Church Baptism Tiernan Bridget 1836 Co. Longford
Church Baptism Ternan Mary 1839 Co. Leitrim
Church Baptism Tiernan Mary 1848 Co. Leitrim
Church Baptism Tiernan Ellen 1850 Co. Leitrim
Church Baptism Tiernan Michael 1856 Co. Leitrim
I found five children for Rose and Bernard. Note that one of them was baptized in Drumlish Catholic parish in Longford; the parish is on the Leitrim border.
Church Baptism Tiernan Bridget 1836 Co. Longford
Church Baptism Ternan Mary 1839 Co. Leitrim
Church Baptism Tiernan Mary 1848 Co. Leitrim
Church Baptism Tiernan Ellen 1850 Co. Leitrim
Church Baptism Tiernan Michael 1856 Co. Leitrim