Shiina Kagari is a war orphan and the adopted daughter of Mayuri Shiina in 2036 in the Beta Attractor Field.
The name Kagari was given to her by Mayuri - a reference to "kagaribi（篝火?)", meaning bonfire -, with the wish that Kagari would be a shining light to everyone no matter how dark the worldline was.
(Souce: Steins;Gate Wiki)
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