There needs to be a slight wording change on that. Switch the "Once per turn," at the start to put "This effect of 'Zephyrina, The Vacuum Maiden' can only be used once per turn." after the effect. Otherwise, the Once per turn only applies to the individual card not all cards named Zephyrina.

EDIT: Here's my proposed revision.

Name: Zephyrina, The Vacuum Maiden
Level/rank: LV 3
Attribute: DARK
Monster Type(s): Spellcaster
Effect:  When this monster is Normal Summoned: Shuffle one card from your hand into your deck and target one face-up monster your opponent controls; banish the target. This effect of 'Zephyrina, The Vacuum Maiden' can only be used once per turn. At the End Phase, if you used this effect; shuffle this card into your deck.
ATK/DEF 1200/1100