Old Semitic root *√Ṣ́ḤQ “to laugh” appears in:
Ugaritic
- yiṣḥaq 𐎊𐎕𐎈𐎖, “he laughs”
Hebrew
- yiṣḥāq יִצְחָק, “he laughs > Isaac”
Arabic
- yaḍḥak يضحك, “he laughs”
In Arabic and Syriac, ’isḥāq إسحاق and ’isḥaq ܐܝܼܣܚܵܩ : “Isaac”, are Hebrew loanwords