The word 'euro' is shown on euro banknotes in the Latin, Greek and (starting with the current series, introduced in 2013) Cyrillic alphabets.
Wikipedia tells us that the European Central Bank aims to redesign the notes every seven or eight years. Citing the EU's own website, it also says that the Cyrillic alphabet was added to the Latin and Greek ones in recognition of Bulgaria, not Croatia. Croatian, along with the other Serbo–Croatian languages, uses a version of the Latin alphabet, created in 1835.
Croatian is one of the ten languages whose versions of the initials of the European Central Bank are displayed, but only on the €50 note. It appears that the new €5, €10 and €20 notes were already in circulation when Croatia joined the EU later in 2013.
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