Everything ella, right from Ella to Bella to Arabella, is hot at present. In Latin, Bella means beautiful. In Italian, Mira bella means "wondrous and lovely." The name Bella was in vogue up to the 13th century, but then it disappeared until its appearance again in the 18th century when
it came into fashion again. Still Bella was one of the less used names with there being a nice hint of an ‘Old World’ grandmotherly touch to it.
The name Bella shot up the charts in 2009 when it became attached to Twilight's Bella Swan. Thus, if you're planning to name your daughter Bella, be aware that there are going to be many girls with proper names like Isabella, Arabella etc. who are going to be called Bella.