A national anthem is most often in the national or most common language of the country, whether de facto or official, there are notable exceptions. Most commonly, states with more than one national language may offer several versions of their anthem, for instance:
The national anthem of Canada, "O Canada", has official lyrics in both English and French which are not translations of each other, and is frequently sung with a mixture of stanzas, representing the country's bilingual nature. The song itself was originally written in French.
"The Soldier's Song", the national anthem of Ireland, was originally written and adopted in English, but an Irish translation, although never formally adopted, is nowadays almost always sung instead.
The current South African national anthem is unique in that five of the country's eleven official languages are used in the same anthem (the first stanza is divided between two languages, with each of the remaining three stanzas in a different language). It was created by combining two different songs together and then modifying the lyrics and adding new ones.
One of the two official national anthems of New Zealand, "God Defend New Zealand", is commonly now sung with the first verse in Māori ("Aotearoa") and the second in English ("God Defend New Zealand"). The tune is the same but the words are not a direct translation of each other.
"God Bless Fiji" has lyrics in English and Fijian which are not translations of each other. Although official, the Fijian version is rarely sung, and it is usually the English version that is performed at international sporting events.
Although Singapore has four official languages, with English being the current lingua franca, the national anthem, "Majulah Singapura" is in Malay and by law can only be sung with its original Malay lyrics, despite the fact that Malay is a minority language in Singapore. This is because Part XIII of the Constitution of the Republic of Singapore declares, “the national language shall be the Malay language and shall be in the Roman script […]”
There are several countries that do not have official lyrics to their national anthems. One of these is the "Marcha Real", the national anthem of Spain. Although it originally had lyrics those lyrics were discontinued after governmental changes in the early 1980s. In 2007 a national competition to write words was held, but no lyrics were chosen. Other national anthems with no words include "Inno Nazionale della Repubblica", the national anthem of San Marino, and that of Kosovo, entitled "Europe".