good luck, joy, congratulations
吉 centers on positive fortune and the happiness that comes with it: good luck, joy, and celebratory congratulations.
吉 combines 士 (scholar or warrior) and 口 (mouth), traditionally interpreted as a wise person's words bringing good fortune. The exact historical origin is debated, but the association with auspicious speech is well established.
A scholar (士) speaks (口) words of blessing and joy, bringing good luck and congratulations.
For キチ, imagine a lucky key chain (キーチェーン) that brings good fortune: key chain -> キチ, and the scholar's words make it a lucky charm.
good fortune (esp. omikuji fortune-telling result); good luck; auspiciousness
10,000 yen note
excellent luck (esp. in fortune-telling)
Yoshinoya (gyudon restaurant chain)
ominous; sinister; unlucky; inauspicious
jingisukan; grilled mutton and vegetable dish
Yoshimoto Kogyo
Yoshino cherry (Prunus yedoensis)
slightly good luck (esp. as an omikuji fortune-telling result)
good news
good luck to come (esp. as an omikuji fortune-telling result); future good luck
Kibi (former province located in present-day Okayama and parts of Hiroshima, Hyōgo and Kagawa prefectures; later split into Bizen, Bitchu and Bingo provinces)
lucky omen; happy; auspicious
lucky omen; good omen
lucky day; auspicious day
good or bad luck; fortune
first calligraphy of the year
Sumiyoshi-kai (yakuza syndicate)
moderately good luck (in fortune-telling)
Mohe (one of the Tungusic-speaking tribes)