Originally, the kanji character '祇' (gi) as in '祇園' (Gion) was formed by combining '示' (ji) and '氏' (shi); however, '祗園' (Gion) today is a misspelling (see wikt, or Wiktionary: '祇').
本来は祇園の「祇」の字は「示」+「氏」と書く(祗園は誤記。wikt祇を参照)。 - Wikipedia日英京都関連文書対訳コーパス
Okami (refer to the Wiktionary on the right) is an ancient word for ryu (dragon), and ryu was worshipped as the god of water and rain.
龗(おかみ。右のウィクショナリーも参照)は龍の古語であり、龍は水や雨を司る神として信仰されていた。 - Wikipedia日英京都関連文書対訳コーパス