Do you have a criteria for names?
Trendy, popular, classic, unusual etc...
Aiden and Ethan are in the top 3/5 most popular names for boys in 05.
I remember a Kenneth in High School. Never went by Kenny.
In this day and age i'd stay away from Kenny 'cause of the South Park reference (unless you are a fan or live somewhere where it is unknown.)
Maybe some names that have NN choices?
Joseph
Jonathan
Christopher
Anthony
Alan
Marcus
Dakota
Austin
Edward
Charles
Would it help if you and your husband write down a list of names (seperatley) that you could go over together and install a new 'rule', he/you can't veto without a reason and a real suggestion.
Having said all that, Family names with meaning are powerful things. If the name Kenneth means A LOT then use it. Ken is a good strong NN.
Maybe use the letters to find another name or another name that starts with K or use their Middle Names to find a First Name. Something along those lines might help as well.
Good Luck