松戸、流山、柏の名前の由来

Why is Nagareyama called “Nagareyama”?
松戸の名前の由来は？
Theory One:
There were large farms to raise horses（うま, Uma）here, so this area was called Umasato, the Home of Horses. Later, people started to abbreviate it “Mazato” which was renamed to Matsudo much later.
説１：
ここは馬の飼育が盛んであった。そこで「馬里（うまさと）」から「まさと」になり、その後変化して「まつど」になったといわれる。
Theory Two:
One old book “Sarashina-Nikki”,which was written in the Heian Era, called this area “Matsuzato”, and later people abbreviated it to“Matsudo”.
説２：
平安時代に書かれた「更級日記」では松里（まつさと）と呼ばれ、その後「松戸」と短縮。

Why is Nagareyama called “Nagareyama”?
流山の名前の由来は？
One legend says a mountain called Mt. Akagi was washed away(流された, nagasareta) and arrived in this area as part of Mt. Joshu Akagi, Gunma.
赤城山は群馬県は上州赤城山の一部が流れついたもの、という伝説がある。

Why is Kashiwa called “Kashiwa”?
柏の名前の由来は？
Kashiwa is named after Kashiba(かしば), which means “a river port”, in Teganuma. Until Japan had the train system, Kashiwa depended on delivering merchandize on the Tone River and other rivers.
柏は手賀沼の河岸場（かしば）にちなんでつけられた。　日本に鉄道ができるまでは、商品の運搬は利根川などで行われていた。