eccum
eccum is a Latin form of ecce, meaning “look! behold!”. It is the adverb.
Found 110 times in the Latin texts on Socratos.
Where it is used
Terence, Andria 3.2.532: Atque adeo in ipso tempore eccum ipsum obviam.
Terence, Heautontimorumenos 4.7.829b: Eccum me, inque.
Plautus, Casina 3.5.713_719: redit éccum tandem opsónatu meus ádiutor, pompám ducit.
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.