Hebrew and Arabic are sister languages (both evolved from Proto-Semitic), so it's no secret that they share many similarities, including vocabulary.
1. Eloha (in Hebrew) and Ilah (in Arabic) are cognates. The word Allah actually means "the god" (combination of definite article "al" + "ilah").
2. Allahuma in Arabic is most probably a loanword from Hebrew (or Aramaic).
3.The origin of YHWH in Hebrew (the original pronunciation is unknown) is disputed. According to the Jewish tradition it is a combination of the verb "to be" in the past, present and future tenses (that is, god is eternal). Another etymology associates it with the Semitic root HWH/HWY, "to blow (wind)", "to drop (from the sky)". It is probably not related to the Arabic words Ya and Huwa.
The cognate of Arabic Huwa (he) is the Hebrew word Hu, with the same meaning.
I speak Hebrew and Arabic