[rdl]

Is it trello like hello, or trello like llello (yeyo)?

I dislike names which 1) can't be said and transcribed unambiguously over a 4kbps bad cellphone call by a non-native speaker to a non-native speaker and 2) don't have an unambiguous pronunciation...people might not mention your product if they're afraid of sounding stupid mispronouncing "ver-say-che", etc.

[polshaw]

I'm going to assume trello, like trellis!

I agree with your points but think trello is fairly unambiguous, considering it was an available (? or cheap) 6 letter .com domain.

[BrandonM]

It's unambiguous if your native language is not a romance language.