Common nicknames:
* Allie: This is a common nickname for names starting with "Al" and is fairly simple.
* Londi: This nickname uses a part of the name and is unique.
Other possibilities:
* Alon: This is a shorter version of the name.
* Londra: This is a more playful, rhyming version.
* Andra: This is a variation using part of the name.
Ultimately, the best short form for Alondra depends on personal preference and the person's personality.