A three-character surname today! 波多野 is usually read Hatano, rarely Hadano, and even more rarely Namitano or Kitano.
波 means wave or billows. It refers not only to ocean waves (as hinted by the water radical 氵) but also to electric, sonic/ultrasonic, radio, brain, and heat/cold waves, and wavelengths. (Maybe other waves too but that's all the waves I can think of now.) It's read なみ or ハ.
多 means many/much or frequent. It’s read おお.い, まさ.に, まさ.る, or タ.
野 means plains, field, rustic, or civilian life. It’s read の, ヤ, or ショ. It's also the only kanji in this post that is not the source of any modern kana characters: the hiragana は is derived from 波 and the katakana タ from 多.
Gorgeous foliage and interesting name! 砺波 is generally read Tonami but can also potentially be Tochinami.
砺 means whetstone or polish, and it's read arato, miga.ku, or rei. (Though it's not the most common character used to write the verb 磨く (migaku), to polish.) It's not super common, but if you've been following, you might recognize it for its resemblance to 杤・栃 horse chestnut.
波 means wave, and it's read nami or ha. It's made up of 氵 the water radical and 皮 skin, hide, pelt, or leather.