This is a list of surnames in which the usage is Japanese; and the meaning contains the keyword water.
Akai 赤井, あかい JapaneseFrom Japanese
赤 (aka) meaning "red" and
井 (i) meaning "well, mine shaft, pit".
Imai 今井, いまい JapaneseFrom Japanese
今 (ima) meaning "now, present" and
井 (i) meaning "well, mine shaft, pit".
Inoue 井上, いのうえ JapaneseMeans
"above the well", from Japanese
井 (i) meaning "well, mine shaft, pit", an unwritten possessive marker
の (no), and
上 (ue) meaning "above, top, upper".
Iwai 岩井, いわい JapaneseFrom Japanese
岩 (iwa) meaning "cliff, rocks" and
井 (i) meaning "well, mine shaft, pit".
Mizuno 水野, みずの JapaneseFrom Japanese
水 (mizu) meaning "water" and
野 (no) meaning "field, wilderness".
Nakai 中井, なかい JapaneseFrom Japanese
中 (naka) meaning "middle" and
井 (i) meaning "well, mine shaft, pit".
Shirai 白井, しらい JapaneseFrom Japanese
白 (shira) meaning "white" and
井 (i) meaning "well, mine shaft, pit".