I think the spelling Kelley is more common among people of more distant Irish ancestry than the spelling Kelly. I don't believe Kelley is even used in Ireland.
It's possible that some Kellys/Kellys are Manx or even Scottish.
Brook, Chen, and Carlson, to name three...
Florenece Kelly was the daughter of the United States congressman William. D. Kelly. Ms. kelly persuaded the stae legislature to pass legislation controlling child labour.She was a progressive in the 20th century who fought for child labor rights and established the Hull House Settlement with Jane Addams
Florence Kelley (September 12, 1859 - February 17, 1932) was a social and political reformer. Her work against sweatshops and for the minimum wage, eight-hour workdays, and children's rights is widely regarded today.
Joe Kelley debuted on July 27, 1891, playing for the Boston Beaneaters at South End Grounds II; he played his final game on October 3, 1908, playing for the Boston Doves at South End Grounds III.
There are numerous sources which have different weights for Australian bushranger Ned Kelly's armour, most of which suggest it weighed between 41 and 50 kg.
Kelley
Kelley Ray's birth name is Ray, Kelly.
Kelley Mckee's birth name is Kelly Lynn Mckee.
Emmett kelly was a clown
Elijha Kelley
The last name Kelley, like Kelly, comes from Ireland, meaning bright headed.
As of September 2021, Kelly Clarkson is 39 years old.
Beth Phoenix is 154 lbs whereas Kelly Kelly is only 108 lbs. That makes a weight difference of 46 lbs or over 20 kilograms
Elijah kelly played the role "Seeweed" in the movie Hairspray
her name is Dori Kelly or Kelley;
This name can be spelt Kelli, Kelly, Kellie, Kellee and Kelley.
Deforest Kelly and his wife Carolyn did not have any children.