This is a list of surnames in which the usage is Japanese; and the meaning contains the keywords red or scarlet or ruby.
Akai 赤井, あかい JapaneseFrom Japanese
赤 (aka) meaning "red" and
井 (i) meaning "well, mine shaft, pit".
Himura 緋村, ひむら JapaneseFrom Japanese
緋 (hi) meaning "scarlet, dark red" and
村 (mura) meaning "town, village".