吾 is not used in the most common form of any of the most useful 10,000 words in Japanese.
Across all words in Japanese, 吾 is used 17 times, read 4 ways.
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ゴ : 3 words FIND ALL
pronoun, 'no' adjective
we(archaic)
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われ : 5 words FIND ALL
Most common form: 我等
pronoun, 'no' adjective
1. we; us
2. I; me(archaic)
(click the word to view an additional 1 meaning and 4 forms, examples and links)
あ- (read as あ) : 8 words FIND ALL
noun
1. eastern Japan (esp. Kamakura or Edo, from perspective of Kyoto or Nara); eastern provinces(archaic)
2. east(archaic)
(click the word to view an additional 1 reading, 2 meanings and 2 forms, examples and links)
わが- (read as わが) : 1 word FIND ALL
pronoun, 'no' adjective
1. I (nuance of arrogance); me; myself(archaic; male term or language)
2. we; us; ourselves
(click the word to view an additional 4 forms, examples and links)
An additional ゴ less common words include 吾 but the reading has not yet been categorized.