Lukasz vs Lukus

Babies given each name, 1880–2025

Lukasz Lukus

Each line is every baby given the name that year, girls and boys added together — the only count that means the same thing for both names. A line breaks where the name fell below five babies in a year — the point at which the SSA stops publishing it — rather than being drawn through a figure nobody published. A single published year in a gap shows as a dot.

Who was ahead

Of the 50 years in which either name was published, Lukus for 33 years and Lukasz for 17 years. The lead changed hands 15 times.

• 1976–1985 Lukus ahead
• 1991–1993 Lukasz ahead
• 1994–2013 Lukus ahead, apart from one short spell
• 2017–2022 Lukasz ahead

11 shorter spells of a year or two are folded into the spans above rather than listed separately.

Side by side

A rank is a position within one sex’s list for one year, so the two rank rows are not subtracted from one another and the winning column is not marked on them. The living figure is a life-table estimate, not a count.

Which name is older

Half of the Lukuses alive today are over 20; half the Lukaszes are over 17. That is 3 years between them: two names in use at the same time, worn by two different generations.

Both names abroad

Countries whose statistics office publishes both names, so the comparison can be made somewhere other than the United States.

Every spelling a country files separately is added together, over whatever years that country publishes — which is not the same range in any two of them, so read the columns against each other and not the rows.

Compare something else

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