Unusual?
On the marriage register here it gives his name as Daniel Mc/MacKene
On the DC it gives McHenry.
Do you have any other documentation that has his actual correct Surname. Normally the marriage register is the most correct as it is from the Horses mouth so to speak. Of course it could have been mistranscribed.
It has happened.
No other marriages of ALGEO, however there is a Mary Algee but not to a BRIGHT. Nor is there any McHenry/Mackene to Bright
Maybe you post a pic of the cert and see if we can make anything of that?
Neil