(Exodus 2:16-18) "And the priest of Midian had seven daughters." Six names were given to him: Yeter, Yitro, Reuel, Chovav, Keini, Putiel. Some say seven names were given to him: Yeter, Yitro, Chever, Chovav, Reuel, Putiel, Keini. Yeter ["surplus"], because he added one section to the Torah. Yitro, because he abounded in good deeds. Chever, because he attached himself to the Omnipresent. Chovav, because he was beloved [chaviv] to the Omnipresent like a son. Reuel, because he was like a friend [re'a] to the Omnipresent. Putiel, because he detached himself [niftar] from idolatry. Keini, because he was zealous [kinei] for the Omnipresent and acquired [kanah] the Torah for himself.
The Seven Names of Jethro the Priest of Midian
Yalkut Shimoni on Torah 169:1
(שמות ב טז-יח) וּלְכֹהֵן מִדְיָן שֶׁבַע בָּנוֹת, שִׁשָּׁה שֵׁמוֹת נִקְרְאוּ לוֹ, יֶתֶר, יִתְרוֹ, רְעוּאֵל, חוֹבָב, קֵינִי, פּוּטִיאֵל. אִית דְאַמְרֵי שִׁבְעָה שֵׁמוֹת נִקְראוֹ לוֹ, יֶתֶר, יִתְרוֹ, חֶבֶר, חוֹבָב, רְעוּאֵל, פּוּטִיאֵל, קֵינִי. יֶתֶר, [עַל שֶׁהוֹתִיר פָּרָשָׁה אַחַת בַּתּוֹרָה. יִתְרוֹ], שֶׁהוֹתִיר בְּמַעֲשִׂים טוֹבִים. חֶבֶר, שֶׁנִּתְחַבֵּר לַמָּקוֹם. חוֹבָב, שֶׁהוּא חָבִיב לַמָּקוֹם כְּבֵן. רְעוּאֵל, שֶׁהוּא כְּרֵעַ לַמָּקוֹם. פּוּטִיאֵל, שֶׁנִּפְטַר מֵע"ז. קֵינִי, שֶׁקִּנָּה לַמָּקוֹם וְקָנָה לוֹ אֶת הַתּוֹרָה.