Yes I remember Obama used to call ISIS by the acronym ISIL.
It was odd that Obama insisted on using those initials rather than ISIS . But he was stubborn about that.
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And I think it was John Kerry and others called it Daesh.
Here’s why - it’s the Islamo name. It’s the anti-colonist name. Obama had to show his respect.
In the Arab world and beyond, the group is referred to by its Arabic-language acronym “Daesh” (alt. Da’esh | Arabic: داعش | pronunc. dah-ESH). The acronym is derived from the group’s extended name: “D” / daal(د) = ad-Dawla, “the state [of]”, “A” / alif(ا) = al-Islamiyya, “Islam”, “E” / ‘ayn(ع) = fi’l- ‘iraq, “in Iraq”, “Sh” / shin(ش) = wa’ash-Sham, “and the Sham (region roughly equivalent to the Levant)”.
The “L” in ISIL stood for Levant. By using that name, one acknowledges that the terrorists have a claim to the whole Levantine region, including Israel.