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Angelique (referring to the flower angelica) is found in "Something Rich and Strange: “Undocumentable” Names From The IGI Parish Records" by Alys Mackyntoich (http://heraldry.sca.org/names/SomethingRichandStrange.html) s.n. Angelique dated from 1579 onwards.
Eglantina (meaning "wild rose") is an Occitan name found in "Names from Fourteenth Century Foix" by Cateline de la Mor (https://www.s-gabriel.org/names/cateline/foix.html).
Fleurance (meaning "blooming, flowery") is found in "Late Period French Feminine Names" by Aryanhwy merch Catmael (http://www.ellipsis.cx/~liana/names/french/latefrench.html) dated to 1507.
Laurencia (meaning "lavender") is found in the Dictionary of Medieval Names from European Sources s.n. Laurencia (http://dmnes.org/name/Laurencia), dated to 1273, 1300. The French vernacular forms Lorence and Laurence are found in the same entry.
Marguerite (meaning "daisy") in "Late Period French Feminine Names" by Aryanhwy merch Catmael (http://www.ellipsis.cx/~liana/names/french/latefrench.html) dated from 1395 onwards.
Olive (meaning "olive tree") is found in several forms in French in the Dictionary of Medieval Names from European Sources s.n. Olive (http://dmnes.org/name/Olive). Forms include the Latinized Oliva (c. 823, 1311) and the vernacular Olive (1565-1568) and Olyve (1567).
Rose is found in "Late Period French Feminine Names" by Aryanhwy merch Catmael (http://www.ellipsis.cx/~liana/names/french/latefrench.html) dated to 1569.
Yolent (meaning "flower") is found in the Dictionary of Medieval Names from European Sources s.n. Yolanda (http://dmnes.org/name/Yolanda) dated to 1292 and 1302. The alternate French spelling Hyolent is found in the same entry, dated to 1292.