There is no Arabic/Islamic name sounding like that that I know of. Where did you hear of this name? It's likely another name mispronounced. A pakistani website had written "Simra" and I looked at it and they actually meant "Thamarah" which means fruit, benefit.
You may use Thamarah (also spelled as Samara, Samra), and it is a good Quranic name directly mentioned in the Quran (in 2:25).
Names that sound close to this: Samirah: Late night conversation. Samraa: A type of wheat, A person with tan colored skin. Sumra: The shaded part of the moon, tan (very light brown) color in skin. Thamraa (some may write it as Samraa, note that it is NOT Thamara): A tree bearing a lot of fruit, something beneficial and successful.
All of these can be used as names for girls and all of the roots of these words are mentioned in the Quran.