For me, the sounds I tend to dislike are:
“Eye”, as in Iris and Linus
“Is/Es/Ice” at the end of girls’ names, as in Iris (again), Agnes, Alice, Lois, Beatrice, etc.
“Us” at the end of boys’ names, as in Linus (again), Julius, Atticus, etc.
“Lia” pronounced with the “l” attached to the second to last syllable and the “ia” slurred into “ya”. Gah, I hate that sound most of all. “Lia” sounds some much prettier pronounced lee-ah, IMO.
Oh, forgot to talk about the sounds I do like!
“Ee”, especially at the end of Greek names like Zoe, Chloe, Daphne, Penelope, Phoebe, etc.
“Ph”, as in Daphne, Phoebe, Seraphina, Josephine, Philip (although I don’t really like Philippa for some reason), Christopher
“V”, as in Eve/Eva, Victoria, Veronica, Evan, and tons of other names.
“Nic” as in Nicholas, Veronica, Dominic, Nicole, etc.
“Z” (including “x” pronounced like “z”) as in Zoe, Elizabeth, Alexander, Balthazar, etc.
“P” as in Penelope, Calliope, Crispin, Casper, Patrick, etc.
“C” as in Catherine, Calliope, Chloe, Crispin, Christopher, Casper
That’s all I can think of at the moment.