There are a couple of possible pronunciations depending on the family history of the person the name belongs to. It's origin is gaelic, and as far as I know, the traditional pronunciation is Wail-ihn. However, if the person is from a family which migrated to America, Australia or somewhere like that, the pronunciation may have been anglicised to Weel-en.
Many such families which kept the Wail-ihn pronunciation would have inadvertently had the spelling anglicised (to Whalen) by record keepers in the new country.
However, it should also be noted that even the Wail-ihn pronunciation of Whelan is an anglicised version of an older name (O Faolain).
Marty Whelan's birth name is Martin Whelan.
Ron Whelan's birth name is Ronald Whelan.
Aimee Whelan's birth name is Aimee Janine Whelan.
Brendan Whelan's birth name is Brendan Joseph Whelan.
Geraldine Whelan's birth name is Geraldine Majella Whelan.
Jill Whelan's birth name is Jill E. Whelan.
Julia Whelan's birth name is Julia May Whelan.
Sarah Whelan's birth name is Sarah Ann Whelan.
Charlie Whelan's birth name is Charles Alexander James Whelan.
Angela Whelan's birth name is Angela Maureen Buckley.
nicky whelan is 5'6 in height
It should be Whelan's house.