I think it's kinda tricky, really. If he's your last, and the 1st 2 have C names... then it's a bit odd. Like maybe he was an afterthought... However, if you plan to have more, I highly recommend breaking the trend. Okay, so Colten and Chase... If your name ends with an N, it might be better to steer away from names ending with an N (my personal preference).
Sorry, that was longer than I expected...
Thank you for your thoughtful response, I agree with you somewhat, he is our last and I do feel like it might be weird if he doesn't get a c name too.... Ugh. I love a lot more names that don't start with C this time though..... You made a bunch of great suggestions.