Names ending in ella

A hybrid of Birdie and Ella used briefly in the early 20th century.

Penella splits the difference between Penelope and Fenella (which in Ireland were historically used as equivalents to each other).

Variant of Maribella

This rare choice from the Rose family might be a variation of Rosalia or a combination name marrying Rose and Ella. That gives you the nicknames Rosie or Ellie.