[Sunred]

The surnames of the Lupinrangers and Patrangers each refer to either darkness or light further solidifying the dichotomy between the two teams.

<LUPINRANGER>
The "YA" in Lupin Red/Kairi's surname Yano means "night".

The "YOI" in Lupin Blue/Touma's surname Yoimachi can also mean night but mostly is used to describe "evening".

Lupin Yellow/Umika's surname Hayami translates to "an easy-to-see chart/diagram" relating to astrology.
However, rewrite it in hiragana and you can see the Japanese word for darkness, "YAMI" is incorporated in the surname thus completing the night-themed naming scheme.


<PATRANGER>
The "ASA" in Patran 1/Keiichiro's surname Asaka means "morning".

The "Hi" in Patran 2/Sakuya's surname Hikawa alone primarily means "sun" or "positive". It is the same word for the chinese word yang in the concept of yin and yang, and alternatively is read as 'yo' when used in words such as 'taiyo' which is the Japanese word for the sun.

The "MYO" in Patran 3/Tsukasa's surname Myojin means "bright".