Isa

Isa is a name with several separate roots that happen to share a spelling. For girls, Behind the Name and Wiktionary both treat it as a pet form of Isabella or Isabel, used in Dutch, German, Italian, Spanish and Portuguese. Isabel started life as a medieval Occitan form of Elizabeth, and Elizabeth comes from the Hebrew Elisheva, built from el, 'God', and shava, 'oath'. Isabel became a royal favourite in Spain, Portugal and France by the twelfth century, which helps explain why its short forms travelled so widely.

For boys, Isa usually has nothing to do with Isabella. In Arabic it is the name by which the Quran refers to Jesus, and it is a common boys' name in Turkey, Bosnia, Albania, Indonesia and Malaysia, sometimes spelled Issa or Eesa. Behind the Name also records an early Germanic boys' name Isa, short for names beginning with the element is, 'ice', while the Dutch Meertens Institute lists it as a short form of Isaac. Wiktionary adds that in Sweden Isa has been a girls' name since at least 1866, there also a pet form of Lovisa and Louise.

In English Isa is said 'EE-sa', two syllables with the stress at the front. It pairs well with a longer middle name such as Isa Rosalind or Isa Catherine, and for brothers and sisters short, open names like Ava, Leo or Ellis keep the same easy rhythm.