The name Jehovah, is used in black Satanic rituals.
Look in Alistair Crowley's "Magick in Theory and Practice"
Whatchoo talkin' 'bout Willis?
By far, the majority of the rituals detailed in MiT&P are "white", meaning they're designed with self-development in mind and making contact with the Divine as opposed to casting "spells", etc., like the Wiccans, etc. do, with the intent of making changes upon the physical plane, or even *gasp*, imposing upon the wills of others, "black" magick.
And, only Satanic in the sense that self-development with an eye towards individuation and empowerment of the Self is in direct opposition to the collective wills of the slave-god religions which oppress and enslave the masses of Gods children today, and as such demonized by the slave-gods' agents as "Evil" and "Satanic".
The "Jehovah" you know is not the same "Jehovah" I know, if there even is such a being in the first place.
Besides, words or names of power are tools to be used in whatever way is deemed necessary by the individual wielding them. It's the intent of the wielder that counts here.