The Russian word for blue is the same, but is never used as a name. In Russian, it's spelled, "синий".
― Anonymous User 8/7/2016
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Sini is one of the older sisters in Johanna Reiss (née de Leeuw)'s award-winning young adult memoirs The Upstairs Room and The Journey Back, set in Holland during World War II and the early postwar years. She passed away on 15 May 2013, at age 91.
I know a girl at my university named Sini who has hazel eyes. Well, that doesn't make any sense. This name only sounds logical on blue-eyed women. Actually, this name only sounds alright on children. I can't imagine this on a grown-up.