Thanks cheesestraws. I've asked two close friends / family IRL and they also said the same. DH thinks the same too. Just that nagging doubt that it would have been nice to have three very different names, just we don't have any plan Bs. I hate thinking of baby names!
Definitely over thinking. All three of mine have names ending in 'ee' - at least the shortened versions. All two syllables too. And the girls even have the same first consonant! Not a problem and hasn't been fr all of the 20 years so far.
Whats more of a problem is the same first initial on the mail for DH and DS!