"Blend of Alexi and Anna"
The name Alexianna is commonly a female name.
Alexianna first appears in United States birth records in 1998, with no recorded use before that year. Its form matches a combination of Alexi, a short form of Alexis or Alexander, with Anna, a name long established in Europe. On that evidence it reads as a modern American blend rather than an inherited name with a documented root or meaning.
The pronunciation of Alexianna is al-ek-see-AN-uh.