My experience is that this almost always gets ignored and in practice “si” is written as シ.
Like in シド・マイヤー (Sid Meier, the first famous person with a si-name that popped into my head)
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グレイーです 
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Mine’s easy, I’m サイダ、彩妥、犀蛇
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Mine is actually pretty close to my real name, Elias. It is: エリアス(eriasu)
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ダニエル = Danieru = Daniel 
I also like how mine sounds kind of like my English name!
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Mine is very simple. Exactly the same as it is as now with no changes.
Nada : ナダ
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Mine is quite simple too. It is ティー・ジェー・
No changes in pronunciation and stress, and every Japanese person I know pronounces it correctly too.
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スペンサー。Which is cool because it has my favorite katakana in it: ペ
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Hey, mine too! Not too many Jerrys in the world anymore (my dad is a Jerry, as well). Oh, and when I’ve used English to Katakana converters before, they elongate the “ri” character. So, ジェリー
Cheers!
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イジー is what I’ve been using in class, but to me it doesn’t really sound like a name… Hoping to study abroad with a host family sometime while I’m in college, so I’m not sure if I’ll stick with that or go by something else. Izzy’s a nickname anyway lol
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I think mine’s pretty easy. アロ lol
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デビッド・キャメロン here (no relation to the famous one!)
I think デビッド is a bit clunky and I’m often DC in English so thinking about using ディーシー for informal purposes. Does anyone have experiences of using nicknames in Japanese?
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My name is アキラ when I go to translate it, even though its a Japanese name, so I wonder why it comes out in Kana?
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Welcome to the community あきら!
You just need to learn to use the settings on the IME on your phone and computer. 
あきら
アキラ
明
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ローズ
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Have you tried taking you katakana name and putting it to Kanji?
ステファニー becomes 捨て風兄 which means “Abandoned Brother”
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Oh! Thanks!
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アシュ I believe! Shame it sounds a bit like a sneeze. It’s Ash. Not short for anything, just Ash
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My name— ソル —sound like 剃る, which means “to shave”.
For real nerds, Sol / ソル is also the name for one full day on Mars.
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