All of those names are terrible for twins! A former colleague said she knew of twins called CĆ“me ( an old French name, I think Cosmo would be the English equivalent) and PacĆ“me. Unfortunately, PacĆ“me sounds just like pas CĆ“me, which means ānot CĆ“meā!
My mum has a twin sister and they have the same initial, which was bad enough when post addressed to Miss S. Lastname.
There are 4 brothers in the block of flats I live in, and they all have names that start with A, which are unusual/obscure. Must be so confusing for them/their parents!
Family friends also have 4 children, 3 girls, one boy, and they all have identical initials, plus silly spellings for said names ( along the lines of Kameron instead of Cameron).
I find it funny that all of the Kardashian/Jenner ladies have names that start with K, except the brother, Robert!
I look after a brother and sister who have lovely classic names that work well in English and in French, and they start with the same initial, and I sometimes muddle them up!