The lovely girl in Song of Songs is compared to a lily of the valleys, a lily among thorns (2:1-2). Shoshana is also a given name for girls, which translates to Lily or Rose. The name was once very common in Israel, but not so much now. In Israeli Hebrew, like many other names, it is accented Shoshànnah, vs. the noun shoshannáh. Popular nicknames in Israel are Shosh or Shoshie.
Probably related to shesh “six,” for the lily has six sepals and six petals, that make two opposite triangles, like the Star of David.
Shoshana has been borrowed in Latin and European languages to become Susanna (and its pet forms: Susie, Sue, Susan, Suzanne).
Yona Sabar, “Word of the Week: Shoshannah”, Jewish Journal (12-18 February 2016), 45.