un lys is the flower called a lily in English.
A lily is 'un lys' (masc.) in French.
'Lily' is an English equivalent of 'lys' [Liliumspp].The masculine nouns 'lys' and 'lis' mean 'lily'. They each have as their singular definite article 'le'['the']. They each have as their singular indefinite article 'un' ['a, one'].But whatever the spelling, each is pronounced 'lees'.
Lily - the girl's name doesn't exist in French - the flower is called 'un lys', but there are many kinds of lily and they all have different names in French.
la fleur de lys - lily of the valley (it was the emblem of the French Kings)
un four is an oven in French
"un bus" is a bus in French.
un sac is a bag in French.
un crâne is a skull in French.
un survêtement is a tracksuit in French.
"un crayon" (masc.) is a pencil in French.
"J'ai un" in French translates to "I have a" in English.
un serpent is a snake in French.