I think it's fine providing they don't spell out something stupid or offensive! Your options are great! My DH's initials spell out ASH and it's been super handy throughout his life for various things.

Friends of our have a hyphinated surname which is S-S and the middle name they had selected for their bubs started with R so thankfully one of their other friends pointed out that they should steer clear of 'A' names for the first name... ARSS. Yeah, not good!