-ina1

1.
a suffix used in the formation of nouns of various types, especially female proper names, musical instruments, compositions, etc.:
Wilhelmina; sonatina.
Compare -in2 , -ine2 .
Origin
< Latin -īna, feminine of -īnus

-ina2

1.
a suffix used in taxonomic names in biology:
Euglenoidina; Nemertina.
Origin
< Neo-Latin, neuter plural of Latin -īnus or Greek -inos; cf. -in1, -ine1
Word Origin and History for -ina

fem. suffix in titles and names, from Latin -ina.