〜ことから
from the fact that, because (as evidence or origin)
Plain form + ことから (な-adj + な / である · Noun + である)
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ことから gives a fact as the basis for a conclusion, a judgement or a name: 道が濡れていることから、夜中に雨が降ったとわかる, "you can tell from the wet road that it rained in the night".
It's very common for explaining where names come from: 富士山が見えることから、この町は「富士見町」と呼ばれている, "the town is called Fujimicho because you can see Mount Fuji from it".
The tone is objective and written, typical of explanations, articles and reports. It isn't used for personal reasons or requests; for those, use から or ので.
Don't confuse it with ことに, which expresses the speaker's emotion ("surprisingly"), or ことで, "by doing".
Examples
富士山が見えることから、この町は「富士見町」と呼ばれている。
This town is called Fujimicho because you can see Mount Fuji from it.
道が濡れていることから、夜中に雨が降ったとわかる。
You can tell from the wet road that it rained during the night.
指紋が一致したことから、彼が犯人だとわかった。
The fingerprints matched, which showed that he was the culprit.
形が星に似ていることから、この名前がついた。
It got this name because its shape resembles a star.
事故が多いことから、ここに信号が作られた。
Because there were so many accidents, traffic lights were put in here.