kitty-come-down-the-lane-jump-up-and-kiss-me

Etymology tree
English kitty
Proto-Indo-European *gʷem-
Proto-Indo-European *gʷémt
Proto-Germanic *kwemaną
Proto-West Germanic *kweman
Old English cuman
Middle English comen
English come
Old English of-
Proto-Germanic *dūnaz?
Proto-Indo-European *dewh₂-
Proto-Indo-European *-nós
Proto-Indo-European *duh₂-nós?
Proto-Celtic *dūnomder.?
Proto-West Germanic *dūnā
Old English dūne
Old English ofdūne
Old English adūne
Old English dūne
Middle English doun
English down
English the
English lane
English jump
Proto-Indo-European *upó
Proto-Germanic *ub
Proto-Germanic *upp
Proto-West Germanic *upp
Old English upp
Middle English up
English up
Proto-Indo-European *h₂ent-
Proto-Indo-European *-s
Proto-Indo-European *h₂énts
Proto-Indo-European *-i
Proto-Indo-European *h₂énti
Proto-Germanic *andi
Old English and
Middle English and
English and
Proto-Indo-European *kw(e)s-der.
Proto-Germanic *kussaz
Proto-Indo-European *-yéti
Proto-Germanic *-janą
Proto-Germanic *kussijaną
Proto-West Germanic *kussijan
Old English cyssan
Middle English kissen
English kiss
English me
English kitty-come-down-the-lane-jump-up-and-kiss-me
From kitty + come + down + the + lane + jump + up + and + kiss + me.
The origin of its name is uncertain; "Kitty" was a common placeholder name for a young woman in folktales. To "come down the lane" possibly refers to where a rural walker or forager would stumble across it, "Jump up and kiss me" possibly refers to how the plant appears in the early spring.