Well of course you could end an H at the end, but only for certain names. Others you could end with “lee” “ly”, “ley”, “lei”, “lynn”, “laide” or “line”; sometimes even an “s”.
[name]Corah[/name], [name]Coralee[/name], [name]Coraley[/name], Coralei, [name]Coralynn[/name], Coralaide, [name]Coraline[/name]
[name]Auralee[/name], Auroralee, Auraley, Auroraly, [name]Auralei[/name], Auroralei, Auralynn, Auroralyn, Auralaide, Auraline, Auroraline, Aurorus
Fionalee, Fionaly, Fionalei, Fionalynn, Fionaline, Fionus
Elenah, Elenalee, Elenalynn, Elenaline Elenis
[name]Silvy[/name], Silvaly, Silvalei, Silvalyn, Silvias
[name]Anorah[/name], Anoralee, Anoralei, Anoralyn, Anoralaide, Anoraline, Annoris
[name]Norah[/name], Noralee, Noralei, Noralynn, Noralaide, Noraline
Tessah, Tessalee, Tessalynn, Tessaline, or just [name]Tess[/name].
Or you could just look up names that are similar to them, but don’t end in A.
Personally, I don’t think there’s anything wrong with two sisters with names ending in A; most people won’t even notice it.