Kennel name - I did just what I made fun of when my mom made up the name for our aluminum fishing boat where she took our initials and named the boat. I took my kids initials and played around with them. MI (michael) JO (jonathan) KR (kristen).
Litter names - this litter of Podengos - I used firsts/significants in the US.
I sometimes start with a theme but then I have a tendancy to drift if a bad pun comes to mind. I started out with the Joker theme (with cards etc) and then came up with Budswizer and that theme was gone......
I do have friends that had A litter and C litter etc and they saved B for the puppy Back from stud service. If you are planning on a lot of litters I think that makes sense and over 30+ years she is now at double letters. Someone else used A,B,C then added a word so it was kennel name, word - then name.