WTF

also: i know its a manga from japan so the author most likely does NOT know about racist slurs from other countries but oh man it really caught me off guard

I think the author named him after the kaffir lime. Other main characters are named after flowers too. Rui Xian is Chinese for Daphne, liliam Valley is lily of the valley, and lycoris radiata is red spider lily etc. Art's name is angel trumpet.

I'm from Poland and I didn't know too. Not everybody knows your culture

The dad is named after the Kaffir lily. All the characters names are for poisonous flowers. In addition to the ones Jypsy listed: Wolf's last name, Eisenhut, is a Germanic name for wolf's bane. Viola's name is probably in connection to pansies, which are mildly toxic. The author of the book, Estella, is a take on daylilies. Gift is an old Germanic way of saying/referring to 'poison'. The Narcissus flower, Crinum lily, and Ranunculus (buttercup) are all toxic. Nova is for a type of Rhododendron, which are very poisonous. Even Shade's name is in reference to 'nightshade', a common moniker for poisonous plants. (In one panel they show belladonna blooming around Shade while talking about how he is promiscuous, a skilled liar, and deceptively charming; all virtues attributed to belladonna.) About 60% of all the flowers shown blooming around the characters are poisonous plants and that character's namesake. (The only name that I'm having a hard time placing is Oria's.)

what about artoda ?

Are you asking about Arutado Brugmansia? Brugmansia is actually the name of an entire genus of poisonous flowers commonly referred to as angel's trumpets.
'Arutado' might be from 'Brugmansia arutadona', which might be a variant name for a type of Brugmansia. But I'm unsure as I've never personally worked with angel's trumpets before.