Yes,that is really rather interesting that they would have two families who named their sons the same. My McClenny family has been in Virginia since 1696 when William E. McClenny came over,family tradition says, as a soldier. William's name has also been spelled MackClenny and if you can get a copy of Nell Nugent's book Cavaliers And Pioneers Vol.3,on page 152 there is a reference to William McClenny acquiring 450 acres of lapsed land in Nansemond Co.,Va. in 1714. On the document the last name is spelled MacClanee. Which is very close to the way you spell your name. My late Uncle Dexter was the one who did a lot of work on the family tree but he couldn't get anywhere when it came to tracing the family in the British Isles. All we know is the name is more likely Scottish than Irish in origin,but we haven't any proof either way really.
Actually I have wondered if McClenny and McLaney aren't both variants of the name McCluny,which is a variant of McClung. It would certainly appear likely that they might at least all originate from the same place as they are all so similiar.
btw:It appears that there are both McClennys and Clennys.
P.S.I wonder if it isn't possible that your ancestor's name might have been McClenny/McClenney to begin with but when they came to Virginia they found out that there was already an existing family of McClennys and so not to get confused they simply changed the spelling to McLaney.