@norselove - If Isla and Riley are close for you then isn't Evie and Riley too close as well?
They are close, but not as bothersome to me. The "ile" sound in Riley and Isla are just so prominent. Riley and Evie are close, but the sounds are different enough to my ears. But I am also pronouncing Evie as Eh-vee (beginning sound of Evelyn)....if it is eve-ee, that is closer to Riley but I still prefer that over Isla. Both Riley and Evie end in the "ee" sound, but the endings don't bother me as much, I guess (I have two girls that end in "a", and it doesn't bother me, they don't feel too matchy)
But judging by the votes, I may be the only one who thinks Isla and Riley are just too similar for siblings