Michaela

Latinate feminine form of Michael, first appearing as an anglicisation of the Portuguese and Spanish Micaela.

Full definition of Michaela

(plural Michaelas)

1897 Grant Allen, The Type-writer Girl, Street & Smith (1900), page 227:Do you remember at Holmwood I called you Michaela, because you were so fair, like the girl in the opera? Now, this type-writer girl is dark, and she has been playing Carmen to you - stealing your love away from you by her clever ways.
2008 Sandra Kitt, For All We Know, Harlequin, ISBN 0373831048, page 176:Edward had asked about her name. What was the origin and the meaning? "Unusual, but it has a nice sound. Kind of like Mahalia."Michaela had lifted her shoulders, helplessly. "I have no idea. My mother said she read it somewhere and liked the sound. And she didn't want me to have a name like everyone else. She said she thought I was going to be special."

Taken up as a name of Anglophones in the 1950s, first in the U.K., later in the U.S.A. with a frequency peak in the 1990s.