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The question in the title is really a factual one, not a matter of opinion.

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In the United States, the Baby Boom is generally defined as those born between 1946 and 1964, inclusive. Generation X is most often defined as those born between 1965 and 1980, inclusive.

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Jeffrey's greatest popularity in the United States occured right along the boundary between the Baby Boom and Generation X. Its peak year was 1966, just two years after the Baby Boom and two years into Generation X. The years it was above 1.5% of male births were 1962-1970, inclusive.

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As, like the majority of names, Jeffrey's decline was less steep than its rise, it probably ends up as somewhat more common among Generation X as a % of members of the generation. But since the birth rate was of course higher during the Baby Boom there may be slightly more individuals named Jeffrey who were born in the Boom years -- notice that when you use raw numbers, the year with the most Jeffreys born in the USA was 1962, the third to the last year of the Boom.

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So it depends on whether one is using raw numbers of Jeffreys or the % of Jeffreys within the age group -- with the former it's probably "more common" among Boomers, with the latter more common among Generation X. But as a name right on the line it's really about equal for these two arbitrarily defined groups.

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https://www.behindthename.com/name/jeffrey/top